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A man, center, supervises a dancing group  during a mass folk dance in front of the Pyongyang Indoor Stadium in Pyongyang, North Korea, Monday, April 15, 2013. Oblivious to international tensions over a possible North Korean missile launch, Pyongyang residents spilled into the streets Monday to celebrate a major national holiday, the birthday of their first leader, Kim Il Sung.

Alexander F. Yuan/AP

A man, center, supervises a dancing group during a mass folk dance in front of the Pyongyang Indoor Stadium in Pyongyang, North Korea, Monday, April 15, 2013. Oblivious to international tensions over a possible North Korean missile launch, Pyongyang residents spilled into the streets Monday to celebrate a major national holiday, the birthday of their first leader, Kim Il Sung.

 Anti Trident demonstrators block the one of the entrances to Faslane naval base on April 15, 2013 in Faslane, Scotland. Activists from across the country, calling for the Trident missile program to be scrapped, converged on the home of Trident to blockade the gates which caused traffic disruption into the naval base.

Jeff J Mitchell/Getty Images

Anti-Trident demonstrators block one of the entrances to Faslane naval base on April 15 2013 in Faslane, Scotland. Activists from across the country, calling for the Trident missile programme to be scrapped, converged on the home of Trident to blockade the gates, causing traffic disruption into the naval base.

Retired North Korean military members stand at attention during an induction ceremony for children into the Korean Children's Union, the first political organization for North Koreans, held at a stadium in Pyongyang on Friday, April 12, 2013.

David Guttenfelder/AP

Retired military officers of North Korea stand at attention during an induction ceremony for children into the Korean Children’s Union, the first political organisation for North Koreans, held at a stadium in Pyongyang on Friday.