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This undated picture released from North Korea's official Korean Central News Agency (KCNA) on January 12, 2014 shows North Korean leader Kim Jong-Un (front L) inspecting the command of Korean People's Army (KPA) Unit 534.    AFP PHOTO / KCNA via KNS    REPUBLIC OF KOREA OUT   THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP    ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / KCNA VIA KNS" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS        (Photo credit should read KNS/AFP/Getty Images)
This undated picture released from North Korea's official Korean Central News Agency (KCNA) on January 12, 2014 shows North Korean leader Kim Jong-Un (front L) inspecting the command of Korean People's Army (KPA) Unit 534.    AFP PHOTO / KCNA via KNS    REPUBLIC OF KOREA OUT   THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP    ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / KCNA VIA KNS" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS        (Photo credit should read KNS/AFP/Getty Images)

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North Korea threatens preemptive nuclear strike

North Korea has threatened a "preemptive and offensive nuclear strike" in response to planned joint U.S.-South Korean military exercises. CNN's Paula Hancocks has the latest.

North Korea threatens preemptive nuclear strike

North Korea has threatened a "preemptive and offensive nuclear strike" in response to planned joint U.S.-South Korean military exercises. CNN's Paula Hancocks has the latest.