A woman walks in central Rason city, northeast of Pyongyang, August 29, 2011. (Photo by Carlos Barria/Reuters)

North Koreans ride bicycles at the banks of the Yalu River near the North Korean town of Sinuiju, opposite the Chinese border city of Dandong, December 18, 2013. (Photo by Jacky Chen/Reuters)

A local resident cycles past a mural depicting former North Korean leaders Kim Il Sung and Kim Jong Il in the North Korean port of Rajin July 18, 2014. (Photo by Yuri Maltsev/Reuters)

Children ride past a wooden fence in Hyesan, August 16, 2014. (Photo by Jacky Chen/Reuters)

A man on his bicycle is seen next to a local vendor near the North Korean Special Economic Zone of Rason City in Rajin, northeast of Pyongyang August 29, 2011. (Photo by Carlos Barria/Reuters)

North Koreans watch from the banks of the Yalu River at the North Korean town of Sinuiju as a Chinese tour boat passes by October 10, 2006. (Photo by Reinhard Krause/Reuters)

North Koreans ride their bicycles outside Pyongyang August 27, 2007. (Photo by Reinhard Krause/Reuters)

North Koreans take a boat tour on the Yalu River near the Chinese border city of Dandong, Liaoning province June 16, 2010. (Photo by Jacky Chen/Reuters)

A North Korean woman pushes her bicycle over a main road in Pyongyang August 26, 2007. (Photo by Reinhard Krause/Reuters)

A North Korean man leads his cow pulling a cart as others ride their bikes over a bridge along the banks of the Yalu River near the North Korean town of Qing Cheng September 12, 2008. (Photo by David Gray/Reuters)

A North Korean woman rides a bicycle with her child on her back, on the banks of Yalu River near the Chongsong county of North Korea, opposite the Chinese border city of Dandong, May 8, 2011. (Photo by Jacky Chen/Reuters)

Residents make their way along a street in North Korea's border town of Kaesong, May 3, 2007. (Photo by Nora Stribrna/Reuters)

A man transports goods with his bicycle in Pyongyang August 26, 2007. (Photo by Reinhard Krause/Reuters)

A North Korean soldier walks next to a farmer as he patrols the North Korean-Chinese border near the Chinese border city of Dandong April 4, 2009. (Photo by Nir Elias/Reuters)

People commute in Haeju, capital of South Hwanghae province which was hit by recent floods and typhoons early September 30, 2011. (Photo by Damir Sagolj/Reuters)