In 1932-1933 the Russians starved over 7 million Ukranians, should the U.S. step in and protect the Ukranians in light of recent events?
With what assets should we "assisting" the Ukrainians, sir?
Don't get me wrong, I think tyranny anywhere should be squashed. However, our own forces are being slashed, and we simply do not have the capability to launch such a mission, at least not for long.
Even inserting a QRF force (82nd or 101st) means entry into a denied area, and then establishing and protecting a logistics tail for that operation.
Forgetting the logistics, we (our leadership) would have to establish a mission with clear, achievable, measurable goals. Then they would have to decide how far they are willing to go to achieve the mission. A defensive action? Or perhaps a slugfest with Russia? What would we gain aside from the "moral high ground?" That and $0.35 will get you a 3 minute phone call.
We are still in Afghanistan, where most of our real combat power is. We have a long logistics tail there. Seeing as our leadership is struggling to hold the line in Afghanistan, can we afford, in money, equipment, and lives, to open a second front, which would likely be a can of worms (at best)?
If not us, who?