Why should an multinational IT company aiming at developers talk in a local language? How does a heritage of founders matters? Google is half a russian company by that metric, as in "Sergey Brin".

JetBrains is a Czech company because it was created in Czech Republic and is operated from Czech Republic. They've had significant development resources in pre-war Russia, like many big companies, because it was a cheap and good. As the war started, they've rescued whoever they could and closed their russian offices.