Slack reportedly deleted all business accounts paid for using Russian cards (twitter.com)

More sources/reports:

https://play.google.com/store/apps/details?id=com.Slack&hl=e...

https://t.me/loordofwar/1969

Similarly done to Iran in 2018: https://techcrunch.com/2018/12/20/slack-iran/

I'm sure there will be an official announcement soon.