That alliance costs money. It doesn't bring anything good in return: the USSR (that this alliance was created against) is long gone. Trump is a genius if he somehow manages to kill 2 birds with 1 stone: make OTHER parties of the alliance want to disband the alliance AND get some piece of land with a unique strategic position all to himself/U.S.

I think it's Putin who is going to be jealous of Trump, not the other way around.