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.
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.
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
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.