NATO was created as a defensive pact to combat Stalin's explicit intentions to conquer the parts of Europe he didn't manage to get at Jałta (his diplomats in late fourties openly said "Jewropa nasza" - "Europe is ours"). It never had any offensive intentions. Nobody in the West wants to conquer Moscow, that would seem like a pointless excercise in XXI century, in which power is made through economic forces and there's no more need to use violence.