North Korea's National Defense Commission Vice Chairman Hwang Pyong So, middle, waves as the country's athletes march at the end of the Asian Games. He's flanked by Workers Party Secretary Choe Ryong Hae, right, and South Korea's Kim Kwan-jin, left, national security adviser to South Korea's president. Dita Alangkara/AP hide caption

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Matthew Miller leaves after his trial at North Korea's Supreme Court on Sunday. The court sentenced the U.S. citizen to six years of hard labor for entering the country illegally and trying to commit espionage. Kim Kwang Hyon/AP hide caption

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Kenneth Bae, an American tour guide and missionary serving a 15-year sentence in North Korea, speaks to The Associated Press on Monday. Bae and two other detained Americans urged the U.S. to send a high-level emissary to secure their release. Wong Maye-E/AP hide caption

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Pope Francis shakes hands with upon his Thursdayarrival in Seoul. The Pontiff arrived in South Korea on the first papal visit to the Asian nation in a quarter century. During his five-day visit, Francis plans to beatify 124 Korean martyrs and encourage a vibrant and growing local church seen as a model for the future of Catholicism. Gregorio Borgia/AP hide caption

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Chinese President Xi Jinping (right) and South Korean President Park Geun-hye greet children waving the two countries' national flags at the presidential Blue House in Seoul on Thursday. Xi has yet to visit North Korea. Kim Hong-ji/Reuters/Landov hide caption

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A propaganda painting is seen outside the People's Palace of Culture in Pyongyang, North Korea, in 2011. North Korean state media reported Friday that the nation has detained a U.S. tourist. Feng Li/Getty Images hide caption

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North Korea apparently doesn't like either of them: President Obama and South Korean President Park Geun-hye at a news conference in Seoul, South Korea, on Friday. Carolyn Kaster/AP hide caption

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This image was taken Jan. 30 by astronauts aboard the International Space Station. North Korea is the large dark patch in the middle. The only significant light is from its capital, Pyongyang. The next photo adds reference points. NASA.gov hide caption

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South Korean Park Yang-gon (left) and his North Korean brother Park Yang Soo get emotional as they meet Thursday during the Separated Family Reunion Meeting at Diamond Mountain resort in North Korea. Park Hae-soo/AP hide caption

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