ActuallyNot is ofc right - in theory: but the only realistic solution would, alas, be Finland after Winter War: it managed to survive but had to cede some territories. The thing is, Putin has very little to lose. He CANNOT "lose". He's playing va banque for months. Unless he's overthrown (and almost certainly killed in the process, which would be awesome!) or the US would resort to nuclear threats (up to threatening with pre-emptive strikes) - which is impossible in the current climate, where the president has clearly dementia and the US/West has been pathologically altruistic for decades (remember the excessive concern for our enemies' casualties in Afghanistan etc. to the detriment of our troops efficiency. Pics of hanged Mussolini were published everywhere: Osama and ISIS monsters were offered Islamic ad hoc burials after US finally got them, rather than publicly humiliating this filth and demonstrating our commitment!).