A man, center, supervises a dancing group during a mass folk dance in front of the Pyongyang Indoor Stadium in Pyongyang, North Korea, on 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.

A child covers the eyes of her father as she sits on his shoulders watching mass folk dancing in front of Pyongyang Indoor Stadium on April 15, 2013.

Singers gesture on the stage while a photo of the late leaders Kim Il Sung, right, and his son Kim Jong Il is projected in the background during a performance held on the eve of the birthday of the former at a theater in Pyongyang on April 14, 2013.

North Korean leader, Kim Jong Un, center, visiting a mausoleum for his deceased father and grandfather at the Kumsusan Palace of the Sun in Pyongyang on April 15, 2013.

Effigies of North Korea's leader Kim Jong Un (L), and his father Kim Jong Il (R), which were later burnt, are seen during a rally in Seoul, South Korea, on April 15, 2013.

A South Korean soldier aims his machine gun as a passenger passes through a ticket barrier during an anti-terrorism drill at a subway station in Seoul on April 15, 2013.

A man takes a photo with his iPad as South Korean soldiers take their positions during an anti-terror and security drill at a subway station in Seoul on April 15, 2013.

Marathon runners pass by a long row of North Korean soldiers as they cross a bridge in Pyongyang on April 14, 2013. North Korea hosted the 26th Mangyongdae Prize Marathon to mark the upcoming birthday of Kim Il Sung.

North Korean military officers watch a marathon runner at Kim Il Sung Stadium in Pyongyang on April 14, 2013.

North Koreans dance beneath a painting of late leader Kim Il Sung during a mass folk dancing gathering in Pyongyang on April 11. The gathering marked the anniversary of the first of many titles of power given to leader Kim Jong Un after the death of his father Kim Jong Il.

Performers carry a flag at the opening of the April Spring People's Art Festival at the East Pyongyang Grand Theater on April 11. The festival opened Thursday to mark late president Kim Il Sung's birthday on April 15, known in North Korea as the Day of the Sun. In the background are portraits of late North Korean leaders Kim Il Sung, left, and his son, Kim Jong Il.

Performers sing about North Korea's late leader Kim Jong Il.

North Korean performers at the opening of the April Spring People's Art Festival.

A South Korean employee, top right, working at the Kaesong Industrial Complex (KIC), speaks to the media upon his arrival at South Korea's CIQ (Customs, Immigration and Quarantine) office, just south of the demilitarised zone separating the two Koreas, in Paju, north of Seoul, April 3. North Korean authorities were not allowing any South Korean workers into a joint industrial park on Wednesday, South Korea's Unification Ministry and a Reuters witness said, adding to tensions between the two countries.

A man uses his mobile phone in front of a specialty shop selling North Korean products, at South Korea's CIQ (Customs, Immigration and Quarantine) office, just south of the demilitarised zone separating the two Koreas, in Paju, north of Seoul, on April 3. North Korean authorities were not allowing any South Korean workers into a joint industrial park on Wednesday, South Korea's Unification Ministry and a Reuters witness said, adding to tensions between the two countries.

South Korean soldiers patrol at the border with North Korea in the Demilitarized Zone (DMZ) near Imjingak in Gyeonggi-do Province, South Korea, on April 2. North Korea said it plans to restart its five megawatt nuclear reactor that was shut down under an agreement reached at the six-party talks in 2007, a move that will allow the North to extract plutonium from spent fuel rods.

South Korea soldiers inside transit office at the Military Demarcation Line (MDL) near the demilitarized zone (DMZ) in Gyeonggi province, South Korea, on April 3. North Korea on April 3 blocked South Korean employees from entering the industrial complex operated jointly by the two countries, only allowing workers to leave, a Seoul official said.

A US Air Force F-22 Raptor takes off at Osan Air Base, south of Seoul, South Korea, on April 3. The US military said it has deployed two F-22 Raptor stealth jets to South Korea as part of ongoing joint military exercises with South Korea. The deployment of the stealth jets marked the latest show of force against North Korea, which issues daily threats of war amid heightened tensions on the Korean Peninsula.

A North Korean soldier looks at the southern side through a pair of binoculars at the border village of the Panmunjom (DMZ) that separates the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, on March 19. The United States is flying nuclear-capable B-52 bombers on training missions over South Korea to highlight Washington's commitment to defend an ally amid rising tensions with North Korea, Pentagon officials said.

University students punch the air as they march through Kim Il Sung Square in downtown Pyongyang, North Korea, on March 29, 2013.

A picture released by the North Korean Central News Agency (KCNA) shows Kim Jong Un convening an urgent operation meeting at 0:30 am on March 29, 2013 at an undisclosed location, in which he ordered strategic rocket forces to be on standby to strike US and South Korean targets at any time.

A picture released by North Korea's official Korean Central News Agency on Tuesday shows Kim Jong Un speaking with female members of an artillery unit during his inspection of the landing and anti-landing drills of KPA Large Combined Units 324 and 287 and KPA Navy Combined Unit 597 at an undisclosed location on North Korea's east coast on March 25, 2013.

Soldiers of the Korean People's Army (KPA) take part in landing and anti-landing drills as Kim Jong Un watches on March 25, 2013.

Kim Jong Un inspects landing and anti-landing drills at an undisclosed location on North Korea's east coast.

Kim Jong Un looks at the latest combat and technical equipment made by unit 1501 of the Korean People's Army, during his visit to the unit on March 24, 2013.

Kim Jong Un holds a gun as he inspects the second battalion under the Korean People's Army Unit 1973, honored with the title of "O Jung Hup-led 7th Regiment", on March 23, 2013.

North Korean leader Kim Jong-Un (C) visits the Wolnae Islet Defence Detachment in the western sector of the front line, which is near Baengnyeong Island of South Korea March 11, in this picture released by the North's official KCNA news agency in Pyongyang March 12, 2013. South Korea and U.S. forces are conducting large-scale military drills, while the North is also gearing up for a massive military exercise. North Korea has accused the U.S. of using the military drills in the South as a launch pad for a nuclear war and has said to scrap the armistice with the U.S. that ended the 1950-53 Korean War.

In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12 by the Korea News Service, North Korean leader Kim Jong Un, third left, looks at South's western border island of Baengnyeong during his visit to the Wolnae Islet Defense Detachment, North Korea. North Korea's young leader urged front-line troops to be on "maximum alert

In this March 11, 2013 photo released by the Korean Central News Agency (KCNA) and distributed March 12 by the Korea News Service, North Korean leader Kim Jong Un, center, confers with military officers at a long-range artillery sub-unit of KPA Unit 641 during his visit to front-line military units near the western sea border 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.

North Korean leader Kim Jong-Un waves while in a boat during his visit to the Wolnae Islet Defence Detachment in the western sector of the front line, which is near Baengnyeong Island of South Korea March 11, in this picture released by the North's official KCNA news agency in Pyongyang March 12, 2013. South Korea and U.S. forces are conducting large-scale military drills, while the North is also gearing up for a massive military exercise. North Korea has accused the U.S. of using the military drills in the South as a launch pad for a nuclear war and has said to scrap the armistice with the U.S. that ended the 1950-53 Korean War.

North Korean leader Kim Jong Un hugs former NBA player Dennis Rodman following a basketball game between the Harlem Globetrotters and North Korean University of Physical Education in Pyongyang, North Korea, on Feb. 28.