Every action there is a reaction. NK builds the bomb, Japan will build the bomb and the means to deliver it. Taiwan will see how the world cannot resist a small nation from building it, they will build the bomb ton deter China. China is the biggest loser in this game because she will have more nuclear powers on her border (India, Pakistan, Russia, North Korea, Japan and even the renegade province of Taiwan) and one of them is mad (NK) and the other (Taiwan) they may have to lose face because they may not be able to retake it.
the question: do we have the will and the courage to take out N Korea's nuclear ambitions?
maybe we can get condi to negotiate with the them and sign a treaty...