I am only guessing, but I cant help but think that ease in which he took, Crimea just 8 years ago gave him a misguided opinion of how easy it would be to take Ukraine. If Finland and a couple others who were not part of NATO, joins, he now has a large border with a Nato Country and possibly another smaller country in thr Black Sea joining Nato. He has lost ships, tanks, and other equipment---plus his yacht in Fiji. Perhaps his rationalization about winning is just additional proof that we are dealing with a mad man. A mad man with a nuclear arsenal !!!