Looking at their latest missiles, they're definitely derived from Chinese missile technology. So, if that's the case, I would expect that they probably have all the latest Chinese technology, which would explain how NK was were able to relatively quickly achieve nuclear capability. The EMP project may have been a joint venture, with the Norks providing the missile and the Chinese providing the device. The Chinese would really like to eliminate our presence in Asia and the Pacific. They would take a short term economic blow, but a weakened U.S. would allow China to expand throughout Asia without any limitations, and they would quickly become the dominant world power. These are turbulent times!