Not surprised either, as the core team was fairly progressive and anti-war, as a lot of Russian techies are. Also, it was the core team that was working on forward facing bets - sort of like a more functional version of Larry Page and Sergey Brin - and they're keeping those forward facing bets.
Middle management appears to still be operating in Russia though.
Edit:
To people commenting below,
IT Professionals and most other white collar jobs are draft exempted in Russia [0]
To make up for the unfairness, mobilized Russian soldiers are being paid Russian/Eastern European white collar level salaries ($2,500/mo) [1]
[0] - https://www.reuters.com/world/europe/russia-excludes-some-it...
[1] - https://www.nytimes.com/2023/03/31/opinion/russia-ukraine-wa...