Personally, I’d like to see Europe man up and deal with Putin themselves. They can’t, because they don’t spend enough on their militaries (some can’t, some won’t) and they don’t want their gas pipeline cut off, so it’s hard for them to bluff, but it’d be nice if they tried.
In my scenario, America gets to play the hero that swoops in when all hope is lost, of course. Maybe a couple years into the war. After China makes some aggressive moves in the Pacific to distract our attention. It would do wonders for our manufacturing sector.