This publication (based in Bulgaria) seems to publish fairly pro-Russian articles, which should be a red flag for news like this. A quick search for Kireev's name returns a lot of contradictory information. I found an article from the Sun [0] (UK-based, not sure how reliable) and from an Indian paper [1] that seem to confirm the news. I can't really comment on the reliability of any of these papers, not being familiar with any of them.
Be careful when reading news articles about the war. This one makes it seem like he was executed without trial. Here's another one that paints it in a different light:
It's perfectly possible that Interfax is a reliable source of information about Ukraine, although it seems to be mostly based in Russia and mostly staffed by Russians, but we do need to remember that they are subject to the "15 years in prison for 'fake' news" law. So I'm taking this with a pinch of salt, or maybe a small handful, until more is known.
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[ 3.1 ms ] story [ 24.3 ms ] thread[0] https://www.thesun.co.uk/news/17857369/ukraine-peace-negotia...
[1] https://www.ibtimes.co.in/ukrainian-delegation-member-killed...
https://interfax.com/newsroom/top-stories/75617/
Seems like he tried to escape arrest and was shot. There's probably a lot more to this story than either of these articles show.