North Korean workers cheer as they celebrate May Day at the Pyongyang Thermal Power Complex in Pyongyang, North Korea, Monday, May 1, 2017. International Workers' Day, which is also known as Labor Day in some countries, is being celebrated worldwide. (Photo by Jon Chol Jin/AP Photo)





North Korean school girls react upon seeing their photograph being taken as they walk along Mirae Scientists Street on Wednesday, April 19, 2017, in Pyongyang, North Korea. Tensions have spiked in recent weeks over North Korea's advancing nuclear technology and missile arsenal. But in Pyongyang, where war would mean untold horrors, few people seem to care much at all. (Photo by Wong Maye-E/AP Photo)





North Korean soldiers get off the backs of trucks as they arrive at the Central Zoo in Pyongyang, North Korea, Thursday, April 20, 2017. (Photo by Wong Maye-E/AP Photo)





North Korean leader Kim Jong-un inspects the defence detachment on Jangjae Islet and the Hero Defence Detachment on Mu Islet located in the southernmost part of the waters off the southwest front, in this undated photo released by North Korea's Korean Central News Agency on Friday, May 5, 2017. (Photo by Reuters/KCNA)





Two North Korean soldiers look at the south side as a South Korean soldier, center, stand guard while U.S. Vice President Mike Pence visited the border village of Panmunjom which has separated the two Koreas since the Korean War, South Korea, Monday, April 17, 2017. (Photo by Lee Jin-man/AP Photo)





Participants perform in a mass dance event on Kim Il- Sung square marking the 105 th anniversary of the birth of late North Korean leader Kim Il- Sung, in Pyongyang on April 15, 2017. (Photo by Ed Jones/AFP Photo)





In a photo taken on April 9, 2017 marathon runner Pak Chol poses for a portrait after winning the Pyongyang Marathon, at Kim Il-Sung stadium in Pyongyang. (Photo by Ed Jones/AFP Photo)





In a photo taken on April 10, 2017 student Jo Chong-A (10) poses for a portrait in a subway station of the Pyongyang metro. (Photo by Ed Jones/AFP Photo)





In a photo taken on April 10, 2017 student Cha So-Yon (18) poses for a portrait in a subway station of the Pyongyang metro. (Photo by Ed Jones/AFP Photo)





In a photo taken on April 9, 2017 students Jo Jong-Im (19, L) and Jo Kwang-Hyok (31, R) pose for a portrait following a mass dance event in central Pyongyang. (Photo by Ed Jones/AFP Photo)





In this photo taken on November 27, 2016, toddler Mun Ji-Song (Moon Ji-sung) (C) poses for a photo with his parents at the entrance to the Central Zoo in Pyongyang. (Photo by Ed Jones/AFP Photo)





In this photo taken on November 25, 2016, sailor Kim Il-Su (Kim Il-Soo) poses for a photo on a boat used to host wedding photo shoots on the Taedong river in Pyongyang. (Photo by Ed Jones/AFP Photo)





In a photo taken on April 11, 2017 Hong Kum-Ju (27) poses for a portrait at the food factory where she works, in the eastern port city of Wonsan. (Photo by Ed Jones/AFP Photo)





In a photo taken on April 11, 2017 chief engineer Choe Yong-Jun poses for a portrait at the Wonsan Youth Power Station, a hydroelectric plant outside the eastern port city of Wonsan. (Photo by Ed Jones/AFP Photo)





In a photo taken on April 13, 2017 Jong Kwang-Hyok (10) poses for a portrait on a football field at a school for orphans on the outskirts of Pyongyang. (Photo by Ed Jones/AFP Photo)





In a photo taken on April 7, 2017 Kim Hyun-U (12) poses for a portrait as he takes part in a seasonal initiative referred to as a “do good things” campaign, in which residents are encouraged to sweep and tidy the city, in a park in Pyongyang. (Photo by Ed Jones/AFP Photo)





In this photo taken on February 21, 2017, Ri Yong-Hwa, 23, poses for a portrait in a classroom at the Kim Jong-Suk silk mill in Pyongyang. A regular fixture on the itineraries of foreign journalists and tourists, the Kim Jong-Suk textile mill is named after the grandmother of current North Korean leader Kim Jong-Un. (Photo by Ed Jones/AFP Photo)





In this photo taken on February 20, 2017, Kim Chol-Nam, 30, poses for a portrait at the ski hire desk where he works at the Masikryong, or Masik Pass, ski resort near Wonsan. (Photo by Ed Jones/AFP Photo)





In this photo taken on February 19, 2017, Pak Han-Song, 11, poses for a portrait on a beginner's slope at the Masikryong, or Masik Pass, ski resort near Wonsan.
AFP was told that Pak was a member of a youth ski camp. The Masik resort was opened in 2013. A price list at the ticket desk advertises a cost of 80 USD for a one-day lift pass and ski hire for foreign tourists, while North Koreans can expect to pay the equivalent of around 40 USD. (Photo by Ed Jones/AFP Photo)





In this photo taken on February 15, 2017, figure skaters Nam Yong-Myong (L) and Choe Min pose for a portrait in Pyongyang. The skaters were performing at the Paektusan Prize international figure skating festival. (Photo by Ed Jones/AFP Photo)





In this photo taken on February 16, 2017, Kim Su-Min, 11, poses for a portrait before offering flowers to the statues of late North Korean leaders Kim Il-Sung (top L) and Kim Jong-Il (top R) at Mansudae hill in Pyongyang. Kim Su-Min was observing the anniversary of the birth of late North Korean leader Kim Jong-il, a public holiday known as the “Day of the Shining Star”, during which residents of Pyongyang leave flowers at the feet of the statue. (Photo by Ed Jones/AFP Photo)





In this photo taken on February 18, 2017, Pak Song Hyang, 30, stands between sewing machines at a facility described to AFP as the 'Pyongyang Bag Factory' in Pyongyang. (Photo by Ed Jones/AFP Photo)





A man holds an umbrella over flowers as people gather to pay their respects at the statues of North Korea founder Kim Il Sung (L) and late leader Kim Jong Il in Pyongyang, North Korea April 14, 2017. (Photo by Damir Sagolj/Reuters)





North Korean children near a cherry blossom tree in Pyongyang, North Korea, 13 April 2017. (Photo by How Hwee Young/EPA)





A guard secures gates of a catfish farm visited by a group of foreign reporters in Pyongyang, North Korea April 17, 2017. (Photo by Damir Sagolj/Reuters)





A military drill marking the 85th anniversary of the establishment of the Korean People's Army is seen in this handout photo April 26, 2017. (Photo by KCNA via Reuters)





North Korea's leader Kim Jong Un watches a military drill marking the 85th anniversary of the establishment of the Korean People's Army (KPA) in this handout photo by North Korea's Korean Central News Agency (KCNA) made available on April 26, 2017. (Photo by Reuters/KCNA)





Boys wearing military uniforms salute as they are photographed in a zoo in Pyongyang, North Korea April 16, 2017. (Photo by Damir Sagolj/Reuters)





This undated picture released by North Korea's official Korean Central News Agency (KCNA) via KNS on April 23, 2017 shows North Korean leader Kim Jong-Un (L) visiting a pig farm at Taechon Air Base of the Korean People's Army. (Photo by AFP Photo/KCNA)





This April 15, 2017 picture released from North Korea's official Korean Central News Agency (KCNA) on April 16, 2017 shows North Korean leader Kim Jong-Un (C) arriving for a military parade in Pyongyang marking the 105th anniversary of the birth of late North Korean leader Kim Il-Sung. (Photo by AFP Photo/Stringer)





North Korean soldiers walk in front of bronze statues of North Korea's late founder Kim Il-sung and late leader Kim Jong Il at Mansudae in Pyongyang, in this photo released by Kyodo April 25, 2017, to mark the 85th anniversary of the founding of the Korean People's Army. (Photo by Reuters/Kyodo News)





An undated photograph released by the Korean Central News Agency (KCNA) on 26 April 2017 shows the combined fire demonstration of the services of the Korean People's Army in celebration of its 85th founding anniversary, at an undisclosed location in North Korea. According to reports, Pyongyang on 25 April deployed aircraft and submarines as parts of artillery drills simulating an attack on “enemy warships”, observed by North Korean leader Kim Jong-un to celebrate the 85th anniversary of the Korean People's Army. (Photo by EPA/KCNA)





A young girl watches as North Korean men and women take part in a mass dance on Tuesday, April 25, 2017, in Pyongyang, North Korea. Pyongyang residents hold mass dances across the city to mark the 85th anniversary of the country's army. Despite deepening tensions on the Korean Peninsula, and reports of a major military drill on the country's east coast, the North's capital was quiet. (Photo by Eric Talmadge/AP Photo)