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South Korean protesters shout slogans during an anti-North Korea rally following a report of the nuclear test conducted by North Korea, in Seoul, South Korea, Tuesday, Feb. 12, 2013. North Korea apparently conducted a widely anticipated nuclear test Tuesday, strongly indicated by an "explosion-like" earthquake that monitoring agencies around the globe said appeared to be unnatural. The letters read " Support, U.N. sanction strongly and Out, Kim Jong Un." (AP Photo/Lee Jin-man)

An activist from anti-North Korea civic group walks past banners bearing messages to denounce North Korea during a rally against North Korea's nuclear test near the U.S. embassy in central Seoul February 12, 2013. North Korea conducted its third-ever nuclear test on Tuesday, a move likely to anger its main ally China and increase international action against Pyongyang and its new young leader, Kim Jong-un. U.N. Secretary-General Ban Ki-moon condemned North Korea's test, saying it was a "clear and grave violation" of U.N. Security Council resolutions. REUTERS/Kim Hong-Ji

Activists from anti-North Korea civic group chant slogans during a rally against North Korea's nuclear test near the U.S. embassy in central Seoul February 12, 2013. North Korea conducted its third-ever nuclear test on Tuesday, a move likely to anger its main ally China and increase international action against Pyongyang and its new young leader, Kim Jong-un. U.N. Secretary-General Ban Ki-moon condemned North Korea's test, saying it was a "clear and grave violation" of U.N. Security Council resolutions. REUTERS/Kim Hong-Ji

An activist from an anti-North Korea civic group defaces a North Korea flag depicting North's leader Kim Jong-un (R) and his wife Ri Sol-ju (L) during a rally against North Korea's nuclear test near the U.S. embassy in central Seoul February 12, 2013. North Korea conducted its third-ever nuclear test on Tuesday, a move likely to anger its main ally China and increase international action against Pyongyang and its new young leader, Kim Jong-un. U.N. Secretary-General Ban Ki-moon condemned North Korea's test, saying it was a "clear and grave violation" of U.N. Security Council resolutions. REUTERS/Kim Hong-Ji

Activists from an anti-North Korea civic group try to tear a North Korea flag during a rally against North Korea's nuclear test near the U.S. embassy in central Seoul February 12, 2013. North Korea conducted its third nuclear test on Tuesday in defiance of U.N. resolutions, angering the United States and Japan and prompting its only major ally, China, to call for calm. REUTERS/Kim Hong-Ji

An activist from an anti-North Korea civic group burns a portrait of North's leader Kim Jong-un during a rally against North Korea's nuclear test near the U.S. embassy in central Seoul February 12, 2013. North Korea conducted its third nuclear test on Tuesday in defiance of U.N. resolutions, angering the United States and Japan and prompting its only major ally, China, to call for calm. The placards read, "Let's pulverize North Korea's nuclear war provocations!" (L) and "Kim Jong-un out!" (R) REUTERS/Kim Hong-Ji

South Korean conservative protesters burn anti-North Korea placards during a rally demonstrating against North Koreas nuclear test on February 12, 2013 in Seoul, South Korea. North Korea confirmed it had successfully carried out an underground nuclear test as a shallow earthquake with a magnitude of 4.9 was detected by several international monitoring agencies. South Korea and Japan both assembled an emergency meeting of their respective national security teams after the incident. (Photo by Chung Sung-Jun/Getty Images)

SEOUL, SOUTH KOREA - FEBRUARY 12: South Korean conservative protesters deface a North Korean flag during a rally demonstrating against North Koreas nuclear test on February 12, 2013 in Seoul, South Korea. North Korea confirmed it had successfully carried out an underground nuclear test as a shallow earthquake with a magnitude of 4.9 was detected by several international monitoring agencies. South Korea and Japan both assembled an emergency meeting of their respective national security teams after the incident. (Photo by Chung Sung-Jun/Getty Images)

A South Korean soldier stands guard at a military check point in Paju near the demilitarized zone dividing the two Koreas on February 12, 2013. North Korea on February 12 staged its most powerful nuclear test yet, claiming a breakthrough with a "miniaturised" device in a striking act of defiance that drew condemnation from global powers including its sole patron China. AFP PHOTO/DONG-A ILBODONG-A ILBO/AFP/Getty Images

South Korean soldiers check military fences as they patrol near the demilitarized zone separating North Korea from South Korea, in Paju, north of Seoul February 12, 2013. North Korea conducted its third nuclear test on Tuesday in defiance of U.N. resolutions, angering the United States and Japan and prompting its only major ally, China, to call for calm. REUTERS/Lee Jae-Won

South Korean army soldiers move during an exercise near the demilitarized zone of Panmunjom in Paju, South Korea, Tuesday, Feb. 12, 2013. North Korea said it successfully detonated a miniaturized nuclear device at a northeastern test site Tuesday, defying U.N. Security Council orders to shut down atomic activity or face more sanctions and international isolation. (AP Photo/Ahn Young-joon)

A South Korean official explains seismic waves of North Korea's nuclear test which were measured in South Korea, at the Korea Meteorological Administration in Seoul, South Korea, Tuesday, Feb. 12, 2013. North Korea said it successfully detonated a miniaturized nuclear device at a northeastern test site Tuesday, defying U.N. Security Council orders to shut down atomic activity or face more sanctions and international isolation. (AP Photo/Yonhap, Lee Ji-eun)

South Korea's Foreign Minister Kim Sung-hwan speaks to the media at the United Nations following Security Council Consolations after North Korea announced they have conducted a third nuclear test on February 12, 2013 in New York City. North Korea claimed the device was smaller than in previous tests. Leaders around the world have condemned the nuclear test and have called for swift action against the reclusive country. (Photo by Spencer Platt/Getty Images)

South Korean protesters burn the pictures of North Korean leader Kim Jong Un during an anti-North Korea rally following a nuclear test conducted by North Korea, in Seoul, South Korea, Tuesday, Feb. 12, 2013. North Korea said it successfully detonated a miniaturized nuclear device at a northeastern test site Tuesday, defying U.N. Security Council orders to shut down atomic activity or face more sanctions and international isolation. (AP Photo/Lee Jin-man)