Perhaps, but it nay be that Ukraine will become even more authoritarian if they win. Russia will say "I told you so". Ukraine will be full of vengeance and will invade Russia. There are ALOT of people who will want "greater Ukraine", the Ukrainian equivalent of lebensraum. It encompasses all of western Russia, and most of Belarus. Ukraine may not be nazi but it is full of nazis, and the war, ultranationalism, and tales of the sacrifices of Azov will only fuel pro-fascist attitudes. The West will turn a blind eye, or even get behind Ukraine for a while, since they want regime change in Russia. Once Russia is out of the picture, then we'd probably go to war with Ukraine.

Just hypothetical of course.