North Korean leader Kim Jong Un, seen here in an undated picture released by the Rodong Sinmun newspaper, has said his country will never give up its nuclear weapons. In the photo, Kim was visiting a hydroelectric power plant. Rodong Sinmun/EPA /LANDOV hide caption

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Armed South Korean soldiers cross a bridge on a truck in the border town of Paju, South Korea, on Sunday, as negotiators from the South and North Korea resumed talks. EPA/Landov hide caption

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An undated composite photograph showing the delegates at the Panmunjom talks on Saturday. (Left to right) South Korean National Security Adviser Kim Kwan-jin, South Korean Unification Minister Hong Yong-pyo, Hwang Pyong-so, the North Korean military's top political officer and Kim Yang-gon, the top North Korean official in charge of inter-Korean affairs. EPA/Landov hide caption

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Visitors look at a miniature map of the Korean Peninsula at the Odusan observatory in Paju, Gyeonggi-do, South Korea, on Friday. North Korea is set to push back its clocks by half an hour to mark the end of Japanese occupation after World War II. Jeon Heon-Kyun/EPA/Landov hide caption

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A farmer stands near a field in South Hwanghae, North Korea. Wong Maye-E/AP hide caption

itoggle caption Wong Maye-E/AP

Gloria Steinem and South Korean peace activists march along a military fence at a checkpoint after crossing the border separating North and South Korea. Jung Yeon-Je/AFP/Getty Images hide caption

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South Korean Foreign Minister Yun Byung-se and U.S. Secretary of State John Kerry hold a joint news conference following meetings at the Ministry of Foreign Affairs in Seoul. Saul Loeb/AFP/Getty Images hide caption

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A man watches a television showing news coverage of the reported execution of North Korea's defense minister, Hyon Yong Chol, at a railway station in Seoul on Wednesday. Ed Jones/AFP/Getty Images hide caption

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An image obtained by Yonhap News Agency showing North Korean leader Kim Jong Un pointing at a ballistic missile believed to have been launched from underwater near Sinpo, on the northeast coast of North Korea, on Saturday. KCNA/EPA/Landov hide caption

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North Korean defector Shin Dong-hyuk came to prominence in a 2012 book about his life in a North Korean prisoner camp. He now says some key parts of his story were not true. His case highlights the difficulty in confirming information in a closed society like North Korea. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images