The McCarthyites here believe that criticising Ukraine means supporting Russia when in reality there isn't a nickel's worth of difference between Russia and Ukraine, both countries were part of the Soviet Union and both countries are as corrupt as the other.
It's a variation on the refrain of "those who are not with us are against us." McCarthyism was similar in that it took the same stance on an ideological basis, which also targeted liberals, progressives, and civil rights leaders whose economic views and sympathies for poor people made them appear to be communist dupes or "useful idiots," if not outright agents of Moscow, in the eyes of U.S. policymakers and others of influence.
Nowadays, since Russia has gone full tilt into capitalism, they are no longer viewed as an "ideological" threat, per se, but more of a right-wing nationalistic threat. The Ukrainians also seem to be displaying a great deal of nationalism as well.
The Western position seems more a legalistic one than anything else. Russia did invade Ukraine, which is a violation of the UN Charter and other international treaties prohibiting aggressive invasion. Legally, the Russians are wrong, so they should just withdraw, and that's the West's first and final word on the whole matter. They violated international law, they broke international agreements and treaties. They're as guilty as a cat in a goldfish bowl, from the West's perspective. I understand this, and I acknowledge that it's true.
But I also know that it's also a war. If lawyers could win wars, the U.S. would have conquered the world a long time ago.