North Korean leader Kim Jong Un has ordered an expansion of the country's production of weapons-grade nuclear materials to accelerate its output of powerful nuclear weapons, state-run media said Tuesday.Kim gave the instructions on Monday as he inspected work being done for mounting nuclear warheads on ballistic missiles, according to the official Korean Central News Agency, which released pictures of objects believed to be warheads of different types.The leader's order came as the United States and South Korea conduct joint military exercises. On Tuesday, the U.S. nuclear-powered aircraft …READ FULL ARTICLE
