North Korean leader Kim Jong Un has vowed to close his country's nuclear test site in May and will let U.S. and South Korean experts and media confirm the closure, the South Korean presidential office said Sunday as it briefed the nation on Kim's remarks made at the inter-Korean summit.The pledge can be seen as the latest show of Kim's resolve to seek denuclearization as the United States prepares for its first-ever summit talks with North Korea. U.S. President Donald Trump said at a rally in Michigan on Saturday that he expects to meet with Kim "over the next three or four weeks."The shutd…READ FULL ARTICLE