How will this affect Jetbrains ?
JetBrains does have offices in Moscow and Saint Petersburg but they're technically a Czech company with their head office in Prague, Czech Republic.
It says:
"The most important thing you can do for Ukraine now is to READ and SHARE verified information about Russia’s attack on Ukraine."
I think they started the war by attacking Ukraine. We shouldn't try to read too much into it.
The company is Czech but the founders and most of the top folks are russian, fwiw.