Excellent Hossein.
If Putin prevails in Ukraine, the nuclear threat is here to stay. Not just with Russia but with any depot or regime around the globe.
The isolationist mentality of America comes at largely unforeseen and enormous costs. The war in Ukraine arguably is one of them. As you point out, it didn't have to happen or the chances reduced.
America's neglect of the world beyond its borders comes at a price too few realize. Biden included. We have a dearth of anything resembling a strategy for China, Russia, Africa, Cuba, Central America, South America and the Pacific Islands.
The best piece I have read of yours. It doesn't matter whether or not we humiliate Putin.