I'd love to see regime change in Russia, since Putin is a war criminal. However, the immediate goal is simply to stop Russia's military expansionism. That's very much something that should be an objective for everyone on earth, because the precedent set here ends up mattering elsewhere. If Russia fails to acquire new territory, such that this is just a huge loss of life and national value for nothing, it sends a message around the world that military expansionism remains a counter-productive and doomed policy, so we'll see fewer such attempts. If, on the other hand, they come away with a bigger Russian empire as a reward for this lawbreaking, then that sends a signal that such a strategy can pay off, and we'll see more of it elsewhere -- e.g., China going after Taiwan, and maybe even eventually trying to swipe islands from Japan. So, we all have a vested interest in making sure this gamble fails for Russia.
That's the same reason that even if you, say, were wise enough to oppose Bush's regime-change invasion of Iraq, it was still possible to think that liberating Kuwait was a good policy, back in the early 1990's, because the world had to send a signal to other potential conquerors that military acquisition of new land was never going to be allowed to stand. Only if we send that message clearly and consistently will such gambits be kept from becoming commonplace. Every would-be expansionist needs to understand that the world will come together to make sure that plan fails.
(from a different American state)