Senior diplomats of Japan, South Korea and the United States agreed Wednesday to boost their security cooperation in reining in the threat posed by North Korea's weapons development program amid growing concerns about the possibility of it conducting a nuclear test.The commitment was made when Japan's Vice Foreign Minister Takeo Mori held a meeting in Seoul with his South Korean and U.S. counterparts following a flurry of missile tests by North Korea, with the trio urging Pyongyang to cease provocative actions immediately and return to negotiations.In a joint statement released by Mori, Sou…READ FULL ARTICLE