SEOUL The United States and South Korea kicked off annual military exercises on Monday, prompting warnings of retaliation from the North, as already-heightened tension on the peninsula has been inflamed by the defection of a Pyongyang diplomat.
North Korea has become further isolated after a January nuclear test, its fourth, and the launch of a long-range rocket in February brought tightened U.N. Security Council sanctions that Pyongyang defied with several ballistic missile launches.
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22:18 Trump says he wants to expand U.S. nuclear arsenal14