South Korean protesters hold pictures of North Korean leader Kim Jong Un during a rally last week in Seoul. Recent satellite imagery indicates the possibility that Pyongyang is readying for a new nuclear test.
Kim Jong Il (right) and his father, Kim Il Sung, are pictured on what is believed to be Paekdoo San, a mountain located along the Sino-North Korean border in this image released by the North Korean news agency in 1994.
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.
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.
A North Korean KN-08 intercontinental ballistic missile rolls past in a military parade in Pyongyang in July to mark the 60th anniversary of the Korean War armistice. A team of U.S. researchers recently found the buildings where the North Korean military is believed to be assembling the launchers.
In this handout image provided by the South Korean Unification Ministry, Kim Kyou-Hyun (right) the head of South Korea's high-level delegation, shakes hands with his North Korean counterpart Won Tong-Yon before their meeting Wednesday in Panmunjom, South Korea.
Wang Yu-chi, head of Taiwan's Mainland Affairs Council, left, shakes hands with Zhang Zhijun, director of China's Taiwan Affairs Office, before their meeting in Nanjing, China, on Tuesday.
Alexander F. Yuan/AP