Ahead of Trump-Xi summit, U.S. warns clock has ‘run out’ on N. Korea

North Korean leader Kim Jong Un oversees a firing contest in Pyongyang, Dec. 21, 2016.WASHINGTON — Days before President Trump hosts his Chinese counterpart, Xi Jinping, a top U.S. official warned Tuesday that “the clock has run out” on decades of diplomatic efforts to rein in North Korea’s nuclear and missile programs, and military action may ultimately be necessary.Hours after those remarks were reported, North Korea fired a ballistic missile into the waters o