They may be bluffing but they are stupid enough to nuke the entire world to prove a point, so I think the USA should back off and create more advance equipment, remember North Korea has hid all it's activity so we can't just piss them off. Though the leader cuts his own hair, he is a very powerful man, who can make these threats cause we can't prove he hasn't got nukes. All I'm saying is if it becomes war, I'm out of it, I can't leave my girlfriend lonely.