** FILE ** 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 greets military personnel at a long-range artillery sub-unit of KPA Unit 641 during his visit to front-line military units near the western sea boarder in North Korea near the South's western border island of Baengnyeong. (AP Photo/KCNA via KNS)
** FILE ** 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 greets military personnel at a long-range artillery sub-unit of KPA Unit 641 during his visit to front-line military units near the western sea boarder in North Korea near the South's western border island of Baengnyeong. (AP Photo/KCNA via KNS)
** FILE ** 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 greets military personnel at a long-range artillery sub-unit of KPA Unit 641 during his visit to front-line military units near the western sea boarder in North Korea near the South's western border island of Baengnyeong. (AP Photo/KCNA via KNS)
** FILE ** 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 greets military personnel at a long-range artillery sub-unit of KPA Unit 641 during his visit to front-line military units near the western sea boarder in North Korea near the South's western border island of Baengnyeong. (AP Photo/KCNA via KNS)
Korean Central News Agency via Associated Press
** FILE ** 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 greets military personnel at a long-range artillery sub-unit of KPA Unit 641 during his visit to front-line military units near the western sea boarder in North Korea near the South's western border island of Baengnyeong. (AP Photo/KCNA via KNS)
** FILE ** In this March 7, 2013, photo released by the Korean Central News Agency and distributed March 8, 2013, by the Korea News Service, North Korean leader Kim Jong-un, with military officials, gets a ride on a boat on his way to a military unit on Jangjae Islet, located in the southernmost part of the southwestern sector of North Korea's border with South Korea. (Associated Press/KCNA via KNS)
Korean Central News Agency via 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 greets military personnel at a long-range artillery sub-unit of KPA Unit 641 during his visit to front-line military units near the western sea boarder in North Korea near the South's western border island of Baengnyeong. Kim 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)
