Well, IMHO a far better option would be a regime change in Russia to eliminate the threat, rather than physically grinding Russia into poverty and oblivion. That would just open up the country to insane extortion and there are lots of dangerous things lying around. Don't know that I would want China buying up the entire Russian Navy and all their nukes, for example. Unless we (the West) are prepared to move in to establish order and remold the country I'd rather they not collapse into chaos.
If American support is all that is keeping Ukraine in the fight, rather than European support, is that really ideal? This is CLEARLY a european concern, not so much ours (had we a different administration we could probably be profiting MASSIVELY off this conflict, selling arms as well as energy/food to shore up all of our economic woes in the process). I'd rather see the EU get their shit together and take care of their own regional issues. The days when we wanted a weak Europe so they could actually go more than a decade without fighting internally are over, we need to collect the rent.
I suspect in 100 years, with perspective, these events will draw a clear line to bad things and future folks will be sitting there saying "wasn't this OBVIOUS?" just like we do for pre-WW1 events.