Nothing to worry about, its all bluff and blustering. Nth Koreans don't want to loose face so they have to put on a show. They know just how far they can push the Americans, its all a game. The reality is if there is a war it all over for North Korea, it will be a toxic wasteland and the Nth Koreans know that and behind closed doors they are shitting themselves. The west needs to know what FACE is and use it to their advantage if they want peace on the Peninsula. Negotiate with the Nth Koreans, that will give them FACE and things will cool down. Threaten them and they loose FACE and thats not a good thing!