Apparently their government messed up years ago so now they all have to die. Seriously, look at the replies from hexbear to your question. The obvious answer is that they were attacked, they now have to defend themselves, and the US and Europe are helping them do that. And even if it's just to weaken Russia, it's also what the Ukrainian people would want, just like you or I would want someone to hand us a rifle if someone is attacking us.
But they can't say that, so they have nothing they can say to this question, no answer, no solution, just what coulda shoulda, etc. They can't empathize with Ukrainian citizens protecting their land when invaded, just like you or I would do, because the US sucks. And it does, but that's besides the point. Oh well. Ukraine has some Nazis so I guess Russia gets to invade their neighbors when they feel like it and take Crimea or similar territories, like they've been doing with Georgia and other places near them for awhile now. And it's their neighbors jobs to just allow it and not ally with anyone to prevent it.