Yeah, the core concept is peace through strength of collective power. Putin likely understands an attack on NATO would not go well for him, judging from how his forces have looked thus far. Unless he's crazy.
the core concept and the entire reason for the Washington Treaty was to prevent Soviet incursion into Western Europe. Soviet Union has been long dead. Instead of disbanding it outright or reimagining it from a military alliance into a political one- US kept expanding it east, stupidly.
NATO existed, and it added 4 more countries (Greece, Turkey, Spain, and Germany) before the fall of the Soviet Union. Cool, fine. Soviet Union died, NATO should've basically died with it. All this expansion has been no good for anybody- certainly not America. Call me crazy, but I don't think a
single dollar of American treasure or
one drop of American blood is worth defending little insignificant shitbag countries like North Macedonia, Montenegro, Croatia, Albania, Slovenia, Slovakia, and all the other akia, ias, and anias in Eastern Europe thousands of miles away from the USA. It's really not our f**king problem. We have enough crap we need to fix here.