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Fascinating stuff. You’ve got to hand it to the russians. At that time, they sure knew how to build.
> Russians

Are you sure about that?

> Are you sure about that?

No. But I'm curious what you're suggesting. The article mentions that the last 2 were built by the Fins. The rest appear to have been Russian-made. Are you suggesting the Russians didn't build any? Or... well... I'm not sure what you're getting at.

The Soviet Union wasn't just Russians. Their shipbuilding industry and space programs were heavily Ukranian.
They are probably suggesting that Ukrainians did it, that’s currently in vogue.
The Soviet Union was made up of many countries and many ethnicities. Yet a lot of impressive stuff including winning WW2 is attributed to Russia and Russians. Ukraine is often brought up these days for obvious reasons but there were many countries and even more ethnicities who get overlooked

Ukraine was the second most populous (accounting for 18 percent of the population whole Russia accounted for 51 percent) and contained a lot of the manufacturing plants. It looks like these particular ships were built in Russia (although I don't know where engineers grew up or what their ethnicity was or if they might have hesitated to identify with Russia) but for instance the head of the Soviet space program Korolev was Ukranian (sort of he was born in Ukraine with Ukranian, Russian, Belarusian, etc ancestry and I've seen claims that he claimed both Russian and Ukranian ethnicity/nationality at different times) also take the flagship Moskva that Ukraine sank that was built in Ukraine as well as the recently memed Soviet Treasure Island (which was made by a studio in Kyiv). Often the west identifies something made in the Soviet Union as Russian even if it's not or if it's more complex to assign it to a modern country. Also part of the way that people think about identity of people like Korolev is based on Russia's and Putin's attempt to rehabilitate the atrocities and weaponize nostalgia about the few good bits. Korolev was sent to the Gulag due to fake accusations, some say he died due to physical injuries from that time preventing quick medical treatment.

I think there was excellent higher education in the soviet union. You have many people with phds, engineers etc. They also promoted intellectual pursuits such as chess. The issue was/is the Communist system and now the unbelievable amount of corruption/organised crime at every level of government. The intellectual class in russia were robbed after the fall of the soviet union. They are scientists, mathematicians, engineers, they are extremely capable, but they have never been given a chance.
Not just corruption, at least during Stalin's rule:

https://en.wikipedia.org/wiki/Lysenkoism

https://en.wikipedia.org/wiki/Nikolai_Vavilov

> Vavilov's work was criticized by Trofim Lysenko, whose anti-Mendelian concepts of plant biology had won favor with Joseph Stalin. As a result, Vavilov was arrested and subsequently sentenced to death in July 1941. Although his sentence was commuted to twenty years' imprisonment, he died in prison in 1943. According to Lyubov Brezhneva, he was thrown to his death into a pit of lime in the prison yard.

Asianometry also has a video "Why the Soviet Computer Failed" [0].

If the Soviet Union had excellent higher education, why was/is Communism and then corruption/organized crime an issue? At what point do phds, engineers, etc take responsibility for the society in which they live? When do the smart people say "we have met the enemy and he is us?" [1]

  0. https://www.youtube.com/watch?v=dnHdqPBrtH8
  1. https://library.osu.edu/site/40stories/2020/01/05/we-have-met-the-enemy/

From the video description:

In 1986, the Soviet Union had slightly more than 10,000 computers. The Americans had 1.3 million.

At the time of Stalin's death, the Soviet Union was the world's third most proficient computing power. But by the 1960s, the US-Soviet computing gap was already years long. Twenty years later, the gap was undeniable and basically permanent.

Why did this happen? The Soviet state believed in science and industrial modernization. Support for research & development and the hard sciences were plentiful. They had the country’s finest minds.

Goodness gracious, they launched Sputnik! They landed on Venus! How did it come to this?

See also their theft of computing intellectual property

https://en.m.wikipedia.org/wiki/Soviet_computing_technology_...

Radar theft: https://www.washingtonpost.com/archive/politics/1985/09/24/s...

Entire books were written on the subject. Here’s one: https://www.csmonitor.com/1984/1126/112610.html

Reminds me of China today.

“ Mueller, operating since 1974, is said by US officials to have set up some 41 dummy firms in Europe and Africa solely for the purpose of facilitating the diversion of sensitive US high tech.

He is the technobandit said to be behind the now-famous attempted VAX computer diversion last year from South Africa to the Soviet Union via West Germany and Sweden.

The diversion trail, as outlined by the authors, demonstrates the lengths to which determined smugglers may go to attempt to avoid detection.

According to the authors, the sensitive computers were transferred from one of Mueller's South African firms, Microelectronics Research Institute (MRI) to another of his South African firms, Optronix. The computers were then resold to a Swiss firm, Integrated Time AG. The Swiss firm was a subsidiary of Mueller's German firm, Deutsche Integrated Time. In the meantime, the computers had been loaded on a ship bound for Sweden and the Soviet Union.

The VAX computers in question had originally been legally licensed for export by the US government to MRI in South Africa, but under the condition that they not be resold or transhipped elsewhere.”

> The intellectual class in russia were robbed after the fall of the soviet union.

They weren't compensated fairly for their work during the soviet union either.

Once they were done shooting all of the engineers for "wrecking" and got around to training a new generation and got all of the western blueprints back from the NKVD they really got to work!

[*edit] If you're downvoting I suggest you read about the waves of purges of engineers[1][2][3] that continued well after the Stalinist purges. Moreover in this context we're talking about a ship powered with a nuclear reactor, and it's well known that Soviet reactor designs were stolen from the West[4] in the early days. Also it's a joke, lighten up.

[1] https://en.wikipedia.org/wiki/Wrecking_(Soviet_Union)

[2] https://www.egr.msu.edu/~amezqui3/personal/extracts/the_gula...

[3] https://www.sciencespo.fr/mass-violence-war-massacre-resista...

[4] https://en.wikipedia.org/wiki/Atomic_spies

I think most of the downvotes aren't because of your claims about the purges, but because of your wink-nudge implication that Soviet engineers and mathematicians could not achieve anything of note without espionage.
Well to be clear what I'm saying is that they literally murdered a whole generation of engineers, scientists, and technicians. What are you supposed to do from that starting point? Had they not captured train loads of Nazi scientists and literally stollen every significant piece of technology developed in the west for 20+ years it would have taken them FAR FAR longer to develop a lot of this stuff independently. They essentially cut themselves off from the global community and purged all of their talent. They had to bootstrap science and engineering somehow.

No doubt, absent the stalinist purges and closing off of the USSR, then Soviet scientists could have equally participated in the science and engineering going on in the rest of the world.

Everybody and their mother went after Nazi scientists, scientist from the loosing side of the war. von Braun got NASA to the moon and his ex collegues got the satelite for the USSR into space. The USSR lost the technology race in the late 70s and early 80s, up to that point it was close enough to call it even. And that was long after Stalin.
You’re missing my point. The Soviets sent basically all of their scientists and engineers to the front, the GULAG, or to a wall. They had NO way to jumpstart jumpstart science and engineering without espionage and captured scientists a it’s incredibly well documented that whole Soviet industries sprang out of NKVD activities.
The point you seem to be missing is that even with all that, Soviets both had their own ideas, their own implementation of ideas and got ahead of the West in some of the areas. Yes, I'd agree that harsh societal environment greatly diminished the possible outcome - and also that lots of spying was being done by Soviets (to say nothing about the West).

> to the front, the GULAG, or to a wall

Right, but still, after Stalin's death, USSR had a renaissance of sorts - art, science, tech, quality of life improvements across the board. Still not enough to win the Cold War - was likely impossible - but enough to maintain for some time the lead in some areas and be not terribly outpaced in most others. Unfortunately, effects (and conditions) of Khrushchev Thaw could hardly be repeated, and until Gorbachev the country leadership wasn't allowing enough of progress.

One of the points of the article, I believe, is to remind that USSR had their own achievements.

I’m not missing that at all, they did some novel stuff like their work with phages. But the whole of their nuclear industry and several others were built on NKVD theft. And the all of it was fueled by grain stolen from Ukraine and mines and logging camps full of millions of slaves. The brutality in my opinion overshadows everything else.
> But the whole of their nuclear industry and several others were built on NKVD theft.

What do you mean? They didn't have world-class scientists? They didn't compete in thermonuclear weapon race, with test of their own design (Sloika)? They didn't built world first nuclear power plant for the grid in Obninsk? They didn't participate in particles research, e.g. with invention of Tokamak? Did they steal all of that? Or you're just saying that whatever they did, early on they used most important data from spying? Learning from others, and spying for your adversaries both predate USSR by millenniums.

> And the all of it was fueled by grain stolen from Ukraine

You mean, different part of the same country specialized in different activities? Which grain was stolen - and by whom - from Ukraine (you mean, Ukrainian SSR?) when nuclear research was going on, mostly after WWII?

> What do you mean? They didn't have world-class scientists?

The did in fact have some, of course it was a huge place, but the theft of nuclear secrets is well documented, as are other episodes of industrial tech. In fact the Mitrokhin Archives[1] revealed that industrial espionage was one of the primary purposes of Soviet spying. For example in 1971 Agent TONDA gave the KBG two volumes of documents on micro electronic components developed in Tokyo for US aerospace use.

> Which grain was stolen - and by whom - from Ukraine (you mean, Ukrainian SSR?)

I'm referring of course to The Holodomor[2] which was executed at gun point and overseen by Moscow via the NKVD. The whole thing was used by Stalin to clear our rebellious Ukrainians and to fund industrialization.

What I'm saying is that a lot of touted Soviet achievements were built on a foundation of theft, slavery, and ethnic cleansing unrivaled since WWII.

[1] https://en.wikipedia.org/wiki/Mitrokhin_Archive

[2]https://en.wikipedia.org/wiki/Holodomor

So you're condemning USSR as a whole, not just in the scope of this discussion?
I replied above[1], to paraphrase yes. The USSR was founded and build on brutality, and sustained on brutality and repression long after Stalin was gone. If there is such a thing as evil, the government of the USSR was truly and deeply evil.

[1] https://news.ycombinator.com/item?id=33269000

USSR had a lot of really, really bad sides. I just think we're talking about something different here. But overall I agree with you.
From down thread

> So you're condemning USSR as a whole, not just in the scope of this discussion?

Yes. I'm am 100% fully condemning the whole USSR for its full history. The purges, the Holodomor, forced relocations, anti-Jewish programs, the invasion of Czechoslovakia, all of it. The USSR condemned racism in the US while at the same time running an ethnic cleansing program across its whole land mass so massive and pitiless that it would have made an SS officer blush. They condemned colonialism and yet ran South Yemen as a colony until 1990. The evil didn't stop with Stalin, the repression just became a little more graceful.

And you're missing the part where majority of scientists and engineers in GULAG system had their camps be closed R&D and industrial facilities, with various levels of actual internment - considerable portion of it was simply part & parcel of relocation of industry to Siberia.

In fact major names that westerners might know went exactly through that system (Mikoyan and Guryevich actually had a period that was euphemistically referred as "fell out of favour for bad results on MiG-1 fighter"), and slowly relocated back to various locations in the timeframe between end of WW2 and Stalin's death.

And do you know what Mikoyan & Guryevich design bureau did while in GULAG? Spent years building high performance planes that were pushing what was possible for propeller planes, which ultimately got them ready to get back in the high-end fighter design as jet era started.

> where majority of scientists and engineers in GULAG system had their camps be closed R&D and industrial facilities

This is so hilariously untrue I’ve never even seen anyone make this claim before. Tens of thousands of engineers are known to have died digging canals with their bare hands.

Sure some folks like Mikoyan got lucky, but forcing scientists into slave labor is hardly an accomplishment to be proud of.

Then you read nearly nothing of the closed city system, which was also part of GULAG. Was there a lot of idiotic suffering involved and a lot of people killed by the system? Yes. It doesn't mean they had nothing left and had to spy for everything.

And the reason I mentioned the "euphemism" is that they got really lucky - other teams also went through the same system, but for example Yakovlev OKB wasn't censured, whereas MiG OKB probably avoided digging canals only because MiG-3 cleaned some of the bad reputation they got from MiG-1 and for a time both were the major planes for certain categories of air war available in USSR (high altitude intercepts).

I'm familiar with the closed city system, but to say the majority of scientists swept up in the purge ended up in this is laughable. But if you know about those, you have to know that the NKVD was dumping reams of stolen documents from the west on their desks and telling them to copy the designs.Hell the RBMK of Chernobyl fame was based on documents stolen concerning Chicago Pile-1.

That your defense is to say that many scientists in the middle of the century in the USSR were merely doing science in slave colonies is telling.

I don't think anybody's being proud here, the system was indeed repressive, unjust, and absurdly ineffective, and killed a lot of people; it doesn't need to be stated every time. You're very unlikely to find Soviet sympathizers on HN. What's happening is people with actual history knowledge rolling their eyes on some clearly overboard statements, especially about Soviets murdering all their engineers and scientists and stealing the nuclear power technology. Let's not get ridiculous.
It’s pretty clear if you’re familiar with anything available from the NKVD archives that industrial espionage was one of their key functions. There’s good documentation of this we’ll into the 1970s when it was the KGB of course.

It’s also well documented that tons of intellectuals and engineers(broadly speaking) got wrapped up in the Stalinist purges. Writing the charge of “wrecking” into law was a real thing. The deaths of untold numbers of wreckers on the White Sea Canal is no exaggeration. The tyrant of the quota system was very real.

The RBMK being based on Chicago-Pile-1 is well known. The way in which the USSR acquired the atomic bomb is also well documented.

I’d go on to say that any time this topic comes up, a number of Soviet apologists show up. There are actually some fairly prominent members of the community that are unapologetically Stalinists, not many but surprisingly some. It’s still worth rebutting IMHO.

Here’s another example of their theft: smuggling of IBM, DEC, and Intel systems, reverse engineering them, and making clones that worked with varying success/failure

https://en.m.wikipedia.org/wiki/Soviet_computing_technology_...

You're exactly right, it's frustrating that there's a particular brand of technophilic tankie who loves to talk up Soviet computing and denies how much of it was based on stolen devices and schematics.
It was sufficient to say you've got no idea about the Soviet space program (which benefited the most from Nazi tech), no need for long posts.

Soviet rocketry was demonstratively, intentionally, in-your-face domestic, those low ranked Peenemunde engineers were sent home as soon as they helped to build R-1 which was a verbatim copy of V-2 indeed (US got much more from Nazis, namely the best engineers and actual V-2s and equipment and tech). For example practicaly everything in R-7, maybe except for the vague idea of the hydrogen peroxide gas generator to drive the turbopump, was novel at the time. In particular the control system, telemetry, aerodynamic modeling, material science, and both types of the hot separation mechanism. That was entirely intentional.

What they got from Nazis more or less verbatim, was namely radars (later improved on and perfected) and electronic measurement equipment tech. Not nuclear weapons (part of the tech was later stolen by Fuchs and other commie sympathizers from US, but was used to control the scientists results, not directly as a base, so it didn't speed anything up). And especially not nuclear power tech.

You’re focusing too much on the nazi point. Industrial espionage was a key function of the NKVD, as documented in their archives. This continued through at least the 1970s. After WWII and the purges Soviet science and engineering were devastated, and the industrial espionage was key to rebuilding.
> What they got from Nazis more or less verbatim, was namely radars (later improved on and perfected) and electronic measurement equipment tech.

And submarines, the Type XXI German design, by far the most advanced of it's time, served as the basis of multiple Soviet submarine classes (which they quickly outgrew).

>. What are you supposed to do from that starting point?

Have a generation of engineers who weren't held back by white haired out of touch fossils. There should be a maximum age for engineers, scientists, and technicians because in the west they are strangling all innovation in academia.

> Have a generation of engineers who weren't held back by white haired out of touch fossils.

What a bizarre defense of the purges and show trials...

And well anyway, that's not what they did. They placed party officials and "friendly" workers in charge of scientists and engineers and shipped them off to camps if they expressed ideas unfriendly to the party. For a good decade everyone researching plant genetics stopped doing science or ended up in prison[1]. For years they didn't innovate really at all. In the early days they leaned on foreign specialists[2].

[1]https://en.wikipedia.org/wiki/Lysenkoism

[2] https://en.wikipedia.org/wiki/Industrialization_in_the_Sovie...

(comment deleted)
> The debate went back and forth. But in the end, the Congressmen basically admitted that the only reason they wanted the US to build such a machine would be because the Soviets had one too.

I want to see when that admission was made, and how someone got them to admit it. It was the most surprising part of the article for me.

Wouldn't it be great to see more defense spending introspection and honesty.

Here's some more information about the congressional hearings:

“The United States Cannot Afford to Lag Behind Russia”: Making the Case for an American Nuclear Icebreaker, 1957-1961

https://www.cnrs-scrn.org/northern_mariner/vol31/tnm_31_31-6...

Its not surprising Eisenhower vetoed it. He vetoed 39 bills in 1958 alone.

You probably know more about Eisenhower than I do - perhaps you grew up in the US and know its history well.

Can you tell me why this isn't surprising? What about Eisenhower and his vetoing bills in great numbers?

Eisenhower came from a military background, rather than political, and was pretty outspoken regarding his opinions, compared to most politicians. He was comfortable vetoing any bill he thought was wrong. In spite of his reputation as a hard-line anti-communist, his presidential farewell address famously warned against "unwarranted influence, whether sought or unsought, by the military-industrial complex".
Eisenhower was notoriously prudent when it came to spending. The majority of his tenure from 53'-61' congress was controlled by the Democrats. His only power to constrain spending was the veto. Of the 181 bills he vetoed, only two were overridden by congress.

Many people believe that because he vetoed so many bills, it allowed his administration to run a surplus in three of his eight years in office.

Parity with and superiority to the Soviet Union was an overt part of US policy-making for decades. What's changed is that it's somewhat less overt now for various reasons one of them being the there's less of an explicit ideological conflict between the US/allies and its adversaries.
Yeah, people underestimate how important the US/Soviet rivalry was towards the overall ambition of American policies. Having poor quality infrastructure and a poor disgruntled populis was unacceptable as it would be taciturn to admitting defeat. As soon as we lost an enemy, we lost a large amount of institutional motivation to be exceptional
Looks like that's about to change (back) for better or worse. The unipolar world was never really tenable.

I can't think of any major problems that the US government solved since the USSR collapsed. Maybe a little competition at the international level is needed.

With who?

China is a third world country and Russia is making itself into one.

In terms of quality of life, USSR was also a third world country. But a third world country with aircraft carriers and ICBMs is a very different story for those who have to interact with it.
The USSR was by definition a second world country.

Third world countries in the in the 1960 had life expectancy on the order of 35 years. The USSR twice that at 67. Colonialism was not a picnic for the people colonialised.

"Third world" can cover a lot of ground. Argentina was and remains third world, for example, and its life expectancy was 65 years in 1960, so same ballpark as USSR.

And to remind, much of USSR was (and much of Russia still is) colonized people. That, too, translated to rather big differences between the central European part of Russia and, say, Turkmenistan.

What makes you think that? If anything I think the state of the world today is strong evidence that is more unipolar than ever.

The US has demonstrated that it no longer takes threats of MAD seriously and we'll destabilize any country that doesn't fall in line. Look to the obvious situation with Russia and continued pressure to sanction and damage the Chinese economy.

The only way I see this unipolar situation reversing is if someone actually lets some nukes fly

> The US has demonstrated that it no longer takes threats of MAD seriously and we'll destabilize any country that doesn't fall in line. Look to the obvious situation with Russia

How is Russia invading Ukraine, and many countries, including the US, supporting the righteous Ukrainian defence effort any different than what happened during the Cold War in Vietnam, Afghanistan, a bunch of civil wars? MAD is still at play. If it were not, there'd be NATO troops at least from Poland helping defend Ukraine against the Russian agression.

And yes, Russia deserves punishment for it's brutal invasion of a neutral country with genocidal methods. Sanctions are the only possibility that doesn't result in nukes flying today, but sanctions it is. Every time a dictator's land grab wasn't responded to, but appeased, they just came back for more (Hitler, Stalin, Putin, Saddam Hussein).

The US takes MAD very seriously. Russia started this mess in its own, and we have made clear we will respond with force to any nuclear attack
Yes but we often overestimated what they had (especially due to politics, see the whole missle gap thing) and then other people would criticize the mainstream overestimates as underestimates and say we need a ton more military spending
Its reasonable to build something that your competitor has, for which you have no use for today, but may need ASAP tomorrow for unforeseen reasons. In the case of a nuclear icebreaker, it may be rescuing stranded covert operatives or getting a certain ship with certain capabilities to a certain location.
Especially with a potential war partner - if they have a capability you do not, even if you can't figure out a reason for that capability; the enemy may have and you'll need to be able to counter it.
That is apparently the reason the USSR made the Buran space shuttle. They couldn't figure out what the US needed that capability for. Turns out, we didn't either, at least for military applications.
Arguably the Buran was more advanced than the shuttle (it completed one solo flight, orbiting twice and auto-landing), but they never got a chance to do anything else with it.
Put a bunch of nukes in the cargo bay and you have a good idea what the shuttle could be used for.
Or you could just put nukes in missiles that can go in the ground, on planes, in artillery, on ships, or on submarines?
A space shuttle gives zero warning when it starts a bombing run. Which is why the USSR build one of their own.
The space shuttle could be used to steal satellites. I don't think it was ever used in this role or in the related role bringing any satellite back down but it was in the mission profile.

I wonder if there were any missions where a foreign spy satellite was captured inspected in orbit then sent on it's way?

My best guess for the continuing air force interest in a shuttle like platform (the x-37) is for exactly this reason. not bombs but satellite capture.

Spy satellites are usually in very high inclination orbits, particularly polar orbits, so they can sweep out different parts of the earth as the earth rotates under them. From what I understand the Shuttle's very large wings were meant to give it a sufficient glide ratio / cross-range capability to reach a landing strip when returning from a polar orbit, where most spy satellites would be. But the Shuttle was never sent into a polar orbit, so it's safe to assume that sort of mission was never performed.
Why would you need more range returning from a polar orbit? The point of a polar orbit is to make more land features available under the orbit. Shouldn't this give a more flexable deorbit profile?

edit, I actually read the posted message. The requirement was for a once around then land. so consider my question unasked. Salutes

Yep, once around then landing. I think they didn't want to hang around in orbit after doing something that sketchy. I think this sort of capability / mission profile spooked the Soviets; it seemed like a capability that would be useful to an orbital bomber.
> Turns out, we didn't either, at least for military applications

The military purposes for the Shuttle were primarily servicing and refuelling the KH-11 satellites and launching other NRO payloads that couldn't ride a normal launcher.

The cargo bay and cross-range landing performance specifications were derived from those mission requirements.

See Buran.

From the Soviet point of view the Space Shuttles were the largest and fastest first strike nuclear bombers ever created. With enough of them in orbit you just obsoleted all other nuclear delivery methods.

Just because something pretends to be a civilian craft doesn't mean it can't be repurposed into a military one in no time at all.

That sort of thinking helped bankrupt the Soviet Union into oblivion
I really don’t think that would be a revelation that would be hard to get out of someone… probably has zeroes consequences.
> Wouldn't it be great to see more defense spending introspection and honesty.

This would be darkly amusing at the moment. Funding hardware to beat Russia isn’t as hard as it used to be.

> An oil burning icebreaker burned up to 70 tons of fuel in a single day. The Lenin by comparison burns just 45 grams each day.

Huh.

Really puts the energy density into perspective, doesn't it. And nuclear powered steam turbines typically run at 5-10% lower efficiencies than diesel engines too.
No icebreaker, but related in context of energy density:

https://en.wikipedia.org/wiki/Otto_Hahn_(ship)

> In 1972, after four years of operation, her reactor was refuelled. She had covered 250,000 nautical miles (463,000 km) on 22 kilograms of uranium.

Hmm, that seems oddly short. Don't nuclear subs regularly go 20 years between refuelling? But then again they use weapons grade enriched fuel so that's probably why.
Yes, in the german version of the article this is mentioned. It was mostly a small version of a light water reactor using U235 enriched to about 5%, like the larger versions on land used in NPPs.
Interesting choice, also makes it much less of a target than a military sub reactor running on highly enriched uranium.

Considering these icebreakers are probably not very well guarded this is a very good decision for nonproliferation purposes.

Uhm, I referred to the german experimental ship from the 70ies. I actually don't know which type of reactor and fuel the russian icebreakers are using.

Back to the only enriched to 5%, it would still make a good dirty bomb. But probably very unhealthy and impractical to assemble for the 'target audience' interested in such things.

Edit: So it says https://en.wikipedia.org/wiki/OK-150_reactor , three of them. Each using 150.7kg U235 enriched to 90%.

(comment deleted)
There is a blog of the captain of 50 Years of Victory atomic icebreaker: https://dmitry-v-ch-l.livejournal.com/ (in Russian, but with a lot of videos and pictures).

Note that cruises to the North Pole for tourists (mostly Western ones) were a regular thing before the war and sanctions.

Upd. Actually, cruises to North Pole continue. This video features a recent one, with a lot of high school and college students: https://www.youtube.com/watch?v=7b8QMcGfsvY (the author talks too much, but the video is packed with info)

IIRC, the Russian icebreakers are suspected to be unable to operate in the antarctic. Not because they don't work there, but because they can't “cross the equator due to limitations on the maximum inlet temperature of their cooling water”.

https://www.navalgazing.net/Merchant-Ships-Icebreakers#fn1_3

A simple heavy fuel tug boat could solve that problem, at some remarkable cost.
I wonder if you could just have it slowly push a barge that is pumping up cold water from a couple hundred meters and outputting it in front of the intakes.
In weight of all the US and Soviet nuclear powered vessels that can cross the equilateral waters.... I doubt that is true.
You know that reactor cooling designs could be different right?

The US has many warm-water ports; Their nuclear-powered ships already had to handle that. The Soviets had a single warm-water port and they'd have no need to base their nuclear icebreakers there, so they likely went with a simpler, cheaper design - "дешево и топорно".

Interesting to note that Finland's Foreign ministry has blocked the building of a new icebreaker for Russia:

https://yle.fi/news/3-12648960

Ironic that trade continued through decades of the often very tense cold war.

Makes sense given russians are at war against Europe
It would be all good, but russian safety is a disaster. Anything they build is just a waiting disaster due to neglicence in building and maintenance. Just like Kursk and Chernobyl...
Kursk was blown up by US submarine.

Chernobyl was not less safe than other designs of its time. It could be safer for sure.

Russia operates multiple nuclear reactors. They are fine so far.