ed the test a grave threat and Russia urged North Korea to abandon its nuclear arms programme. Earlier China, North Korea’s sole major ally, summoned Pyongyang’s ambassador to convey strong dissatisfaction.President Obama is expected to announce in a few hours time that he will withdraw nearly half of all American troops serving in Afghanistan within a year. Mr. Obama will announce the decision during his first State of the Union Address since his reelection in November. From Washington, here is Mark Mardell.
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