Why should Americans be involved one bit in the war between Russia and the UK, and whoever the latest proxy in it today is? It's been going on for 500 years, and it'll likely go on for another 500. So far it's just been a way to extract money from the tax base (or rather, run up the national debt through the money printer) to enrich private defense companies.

If the UK and Ukraine want to fight this war, more power to them. They can pay cash, just like we made the UK pay cash in WWII. Putin may not be a great guy, but surely, neither was Hitler. And definitely, neither is the Crown an institution worth bending over for, especially given their history in and toward the US itself.