The genie is out of the bottle regarding Ukraine. We don't have a compelling national interest to get involved. What we do have a compelling national interest in is the national sovereignty of our friends and allies in the region.
It appears Vlad is looking for his own "reset" ie rebooting the cold war. I'm not completely opposed to providing material and support to nations afraid of being absorbed into a USSR v2. Unfortunately we don't seem to have a brain trust in charge who could pull that off with the subtlety and deftness such an undertaking would require. Talks around accelerating the implementation of the Aegis Ballistic Missile Defense System in Poland might send the message that there are red lines even fickle Democrats won't ignore.
Really though this is something that the free nations of Europe should be pursuing. If they "feel" like they can't count on Team America World Police and have to buck up themselves a bit I'm OK with that idea.
Actually I would like to see us focus more on getting our own house in order here stateside; then maybe trying to exercise a little more soft power in our own hemisphere. We need to fire up the ol' US economic power house and that alone will put fear back into our enemies heart.
Putin isn't an idiot. He wants to make Russia strong, and make it strong with him solidly in place as a leader. He knows exactly what he can get away with, and apparently he knows how to accomplish his mission. The times the US has had similar levels of drive to get *expletive deleted*it done are the times we have flourished, and done it quickly.
If Putin can pull it off, look for a stronger Russia.
As far as I am concerned, the Cold War never ended and the Russians never ceased being enemies. Unfortunately, our leaders lost sight of the threat and decided to ignore them.
Oh, and a strong Russia unencumbered by the idiocy of Communism or the Czars is going to be a force to be reckoned with indeed.