It broke my heart to hear the Ukrainian foreign minister give one reason why Americans should care, that we keep our promises (see geezer's comments about the disarmament treaty with them). We don't. I got an earful about this from a Hungarian colleague who was old enough to remember when the Soviet Union invaded Hungary in 1956. He was still mad about it, and I couldn't blame him. We keep our promises when it's convenient. In this sense, our government is no different from any other government. Our strength is our people, not our government.
I mourn for the Ukrainian people, and I think we should put on more severe sanctions, but that may not be possible. Apparently some of our allies do not want us to ban Russia from the Swift banking system, and the same may be true for putting sanctions directly on Putin and his family (does he even have a family?). It is, to a large extent, Europe's fight, so I'm not sure going over their wishes is a viable option, even if it would be the best option.
I've found this to be so depressing. I feel like we're being dragged back into the height of the Cold War, but then again, I'm not too sure we weren't already there--with China.