So Russia is invading? That alone, pretty much regardless of the reason, is enough to side with Ukraine.

But that reason, even if true, is one of the stupidest reasons to invade. A softer, more propaganda focused approach would be both far more effective and far less costly, in both lives and resources. So either Russian leadership is so useless that an invasion is the best they can come up with, or they’re invading to take over Ukraine. Incompetent to the point of malice, or malice. Take your pick.