Top national security advisers of Japan, the United States and South Korea agreed in their meeting in San Francisco to work closely together in seeking the denuclearization of North Korea, the Japanese government said Monday.The trilateral talks on Sunday brought together Shotaro Yachi, Japan's national security adviser, his U.S. counterpart H.R. McMaster, and Chung Eui Yong, the head of South Korea's National Security Office.The three officials agreed not to repeat their countries' "past failures" in efforts to halt the North's nuclear and missile programs and reaffirmed that they will "co…READ FULL ARTICLE