NATO countries are pledged to fight as one if any of them are ever attacked.
...a pledge is a deterrent only if you intend to keep it and then only if your adversary believes that you intend to keep it. After 8 years of Obama pussyfooting around (with the aid of the worst secretary of state in world history) it is possible that they (much like the nviets) don't believe that we have the guts to see it thru. If N Korea nuked japan how many democrats could you count on to give trump a declaration of war? As far as that goes, if N Korea were to nuke a red state???
Liberals are like a "Slinky". Totally useless, but somehow ya can't help but smile when you see one tumble down a flight of stairs!