Russia has stated their position on Ukraine quite clearly. They want a binding agreement that Ukraine will not be part of NATO and not be a base for offensive weapons on their border, much as we did with Finland. If we don’t guarantee that, Russia will feel obligated to occupy the nation to preserve it as a buffer.
How is that different from our position on offensive weapons in Cuba, over which we nearly went to war 60 years ago?
This is not a partisan issue, repeated US Presidents have engaged in the same brinkmanship for a long time, but it is beginning to look like Russia is the reasonable player in this contest.