USA in noway can protect its allies under its nuke umbrella.As the three recent incidents have shown the world that usa is quiet an unreliable ally...It wont take long for usa to leave its allies in cold waters as it did with....
1.Georgia.. during russia-georgia war. We have no explicit treaty obligations with Georgia.
2.South korea.. during cheanon sinking by north korea. What have all these excercises been?! South Korea doesn't want to lose blood and treasure over N Korea so we did the next best thing.
3.Japan.. during china-japan dispute over island claim. We performed military excercises with intent of taking back islands against an unnamed aggressor. Just because the document says we aren't obligated to doesn't mean we wouldnt for the precise reasons stated, it would make us look like a bad ally to an ally infinately more important than Georgia is at this point.
4.Pakistan..which has been repeatedly betrayed and disabused by usa for past 63 years under the cloak of a ally.Oh cmon Pakistan wasn't ever an ally, and they obviously never thought of themselves as such. They were using us as we were using them.