In the face of mounting threats from North Korea, President Barack Obama on Thursday urged closer security ties among its chief allies in Asia and increased cooperation with strategic rival China to discourage Pyongyang from further advances in nuclear weapons. As world leaders gathered for a nuclear security summit, Obama first met with Japanese Prime Minister Shinzo Abe and South Korean President Park Geun-hye.

Together, they warned North Korea would face even tougher sanctions and more isolation if provokes again with nuclear and missile tests. Then Obama met Chinese President Xi Jinping and both called for North Korea to give up its nuclear weapons. China also agreed to implement in full the latest economic restrictions imposed by the U.N. Security Council against Pyongyang. READ MORE