Supporting a Democrat-led expansionist proxy war causes the criticism of Republican-led expansionism to fall flat. But that’s actually a pretty great representation of the fickle morality of liberals, so maybe I’m being too harsh.
There didn't need to be U.S. political justification for U.S. to support Ukraine. U.S. supported a democratic nation getting invaded by an authoritarian nation... as it should ALWAYS do. That's one of the things that makes it the shining beacon on the hill.