What is even less hypotethical is that dozens of countries are now actively making plans to arm themselves with nuclear weapons, as the US refuses to take the risk to step in.
Dare to guess what are the risks of nuclear war (even by accident) when that becomes the new normal?
The Russian aren't going to make less nuclear threats if the US keeps folding.
Because if Ukraine falls I can guarantee you that first it will be minor incursions into Poland and/or Baltics airspace. Then false flags attacks. Then more. Each time testing "escalation management" and sewing disagreements into political scenes in the West. Then more.
putin has said many times that he considers collapse of USSR the greatest tragedy ever. He wants revenge for this. And he is getting it.
They're referring to the sudden end of support for Ukraine, done at the behest of Donald Trump. Republican lawmakers were actually considering continuing it until he demanded they not do so.