No, it’s not just the taxes, though that’s obviously a component of it. A quick google search will lead you to find that they are obligated by law to directly contribute to Russia’s military efforts by registering its draft-eligible staff, turning over information relevant to the war, assisting in the delivery of military equipment, and providing physical infrastructure, among other things.
Ukrainian or not, this isn’t just “oh well you’re kind of indirectly supporting the war by funding the government”. It is a very direct form of involvement.
tinwhiskers
KbinItTogether