Kim Jong-un calls US 'biggest enemy' and says nuclear submarine plans 'complete'

North Korea should 'further advance nuclear technology' and develop more flexible attack capability, leader tells party congress North Korea's leader, Kim Jong-un, has called the United States his nuclear-armed nation's "biggest enemy" and revealed that plans for a nuclear-powered submarine are complete, state media said. Kim's declaration on Saturday also included a call to develop smaller, more adapatable nyuclear warheads, comes less than two weeks before the inauguration of Joe Biden as US p...