when the US cuts them all off... like it is slowly cutting dumb, noisy, little Ukraine off.
Well, only in case your deranged Trumpturd can fool enough Trumptards to vote for him...Kinda right. If Trump wins, we will have peace in Ukraine and Russia, and probably in the China-Taiwan thing, and in many other places in the world.
But well not actually peace, see below:
Then, the US will probably resign from Nato, and there will be even more peace.
I doubt it. Once Putin realizes he can burn down half of Europe without much resistance, he'll certainly do it. 
Or haven't Russians said "we'll march to Warsaw / Berlin / Paris / London"? It's just one of my nightmares, I guess...