North Korea said Sunday that leader Kim Jong Un supervised test-firings of an unspecified new weapons system, which extended a streak of launches that are seen as an attempt to build leverage ahead of negotiations with the United States while driving a wedge between the U.S. and South Korea. The report by North Korean state media came hours after President Donald Trump said that North Korean leader Kim Jong Un expressed a desire to meet again to start nuclear negotiations after the end of ongoing joint U.S.-South Korea military exercises, and that he apologized for the flurry of recent short-range ballistic launches that rattled U.S. allies in the region.