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A North Korean soldiers stands before spectators during a mass military parade at Kim Il-Sung square in Pyongyang on October 10, 2015. North Korea was marking the 70th anniversary of its ruling Workers' Party. AFP PHOTO / Ed Jones        (Photo credit should read ED JONES/AFP/Getty Images)
A North Korean soldiers stands before spectators during a mass military parade at Kim Il-Sung square in Pyongyang on October 10, 2015. North Korea was marking the 70th anniversary of its ruling Workers' Party. AFP PHOTO / Ed Jones        (Photo credit should read ED JONES/AFP/Getty Images)

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North Korea threatens 'preemptive' nuclear strike

North Korea threatens "preemptive and offensive" nuclear strike in response to U.S. - South Korean military exercises. CNN's Brian Todd reports.

North Korea threatens 'preemptive' nuclear strike

North Korea threatens "preemptive and offensive" nuclear strike in response to U.S. - South Korean military exercises. CNN's Brian Todd reports.