In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un rides on a boat, heading for the Wolnae Islet Defense Detachment, North Korea, near the western sea border with South Korea. North Korea's young leader urged front-line troops to be on "maximum alert" for a potential war as a state-run newspaper said Pyongyang had carried out a threat to cancel the 1953 armistice that ended the Korean War. (AP Photo/KCNA via KNS) JAPAN OUT UNTIL 14 DAYS AFTER THE DAY OF TRANSMISSION

Associated Press
In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un rides on a boat, heading for the Wolnae Islet Defense Detachment, North Korea, near the western sea border with South Korea. North Korea's young leader urged front-line troops to be on "maximum alert" for a potential war as a state-run newspaper said Pyongyang had carried out a threat to cancel the 1953 armistice that ended the Korean War. (AP Photo/KCNA via KNS) JAPAN OUT UNTIL 14 DAYS AFTER THE DAY OF TRANSMISSION
In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12, 2013 by the Korea News Service, North Korean leader Kim Jong Un rides on a boat, heading for the Wolnae Islet Defense Detachment, North Korea, near the western sea border with South Korea. North Korea's young leader urged front-line troops to be on "maximum alert" for a potential war as a state-run newspaper said Pyongyang had carried out a threat to cancel the 1953 armistice that ended the Korean War. (AP Photo/KCNA via KNS) JAPAN OUT UNTIL 14 DAYS AFTER THE DAY OF TRANSMISSION
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