North Korean leader Kim Jong-un visits a Mushroom Farm in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang July 16, 2013. (Photo by Reuters/KCNA)

North Korean soldiers applaud as North Korean leader Kim Jong-Un (not pictured) visits a sub-unit under the Korean People's Army Unit 552 in this undated picture released by the North's official KCNA news agency in Pyongyang August 7, 2012. (Photo by Reuters/KCNA)

North Korean leader Kim Jong-un (C) visits Pyongyang Essential Foodstuff Factory in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang June 8, 2013. (Photo by Reuters/KCNA)

Residents greet North Korean leader Kim Jong-Un (C) during his visit to the Jangjae Islet Defence Detachment and Mu Islet Hero Defence Detachment on the front, near the border with South Korea, southwest of Pyongyang March 7, 2013 in this picture released by the North's official KCNA news agency in Pyongyang March 8, 2013. (Photo by Reuters/KCNA)

Photo released by Korean Central News Agency on August 7, 2012 shows Kim Jong Un (L), top leader of the Democratic People's Republic of Korea (DPRK), talking to soldiers in a dormitory of a contingent of Unit 552 of the Korean People's Army on August 6, 2012. (Photo by KCNA/Xinhua/SIPA Press USA)

This photo released by North Korea's official Korean Central News Agency (KCNA) on June 7, 2012 shows North Korean leader Kim Jong-Un (C) surrounded by members of the Korean Children's Union (KCU) organizations during a joint national meeting to celebrate the 66th anniversary of the KCU organizations at Kim Il-Sung Stadium in Pyongyang on June 6, 2012. (Photo by AFP Photo/KCNA via KNS)

This undated picture released from North Korea's official Korean Central News Agency (KCNA) on July 15, 2012 shows North Korean leader Kim Jong-Un talking to two children as what seems to be the same woman (back L) who has recently been pictured accompanying Kim smiles during a visit to Kyongsang kindergarten in Pyongyang. (Photo by AFP Photo/KCNA via KNS)

This undated photo released by North Korea's official Korean Central News Agency (KCNA) via the Korean News Service (KNS) on August 24, 2012 shows North Korean leader Kim Jong Un (C) inspecting the Thrice Three-Revolution Red Flag Kamnamu Company under Korean People's Army Unit 4302 at an undisclosed location in North Korea. (Photo by AFP Photo/KCNA via KNS)

This picture released from North Korea's official Korean Central News Agency on November 5, 2012 shows North Korean leader Kim Jong Un (C) inspecting the newly built Breast Cancer Research Centre at the Pyongyang Maternity Hospital. (Photo by AFP Photo/KCNA via KNS)

This recent undated photo released by North Korea's official Korean Central News Agency (KCNA) on August 1, 2013 shows North Korean leader Kim Jong-Un (C) meeting with members of the country's women's football team who won the recent 2013 East Asian Cup in South Korea. North Korea defeated China 1-0 in their final East Asian Cup women's match on July 27 in Seoul, and South Korea defeated Japan, allowing North Korea to win the regional event for the first time. (Photo by AFP Photo/KCNA via KNS)

This undated picture released from North Korea's official Korean Central News Agency (KCNA) on February 5, 2014 shows North Korean leader Kim Jong-Un (C) visiting the baby home and orphanage in Pyongyang. (Photo by AFP Photo/KCNA via KNS)

This undated picture released from North Korea's official Korean Central News Agency (KCNA) on February 5, 2014 shows North Korean leader Kim Jong-Un (C) visiting the baby home and orphanage in Pyongyang. (Photo by AFP Photo/KCNA via KNS)

This undated picture released by North Korea's official Korean Central News Agency (KCNA) on March 7, 2014 shows North Korean leader Kim Jong-Un (C) inspecting the Korean People's Army (KPA) Air and Anti-Air Force Unit 2620 honored with the Title of O Jung Hup-led 7th Regiment at an undisclosed location in North Korea. (Photo by AFP Photo/KCNA via KNS)

This undated picture released by North Korea's official Korean Central News Agency (KCNA) on March 7, 2014 shows North Korean leader Kim Jong-Un (4th R) saluting with female pilots as he inspects the Korean People's Army (KPA) Air and Anti-Air Force Unit 2620 honored with the Title of O Jung Hup-led 7th Regiment at an undisclosed location in North Korea. (Photo by AFP Photo/KCNA via KNS)

This undated picture released by North Korea's official Korean Central News Agency (KCNA) on March 7, 2014 shows North Korean leader Kim Jong-Un (3rd L) being franked with female pilots as he inspects the Korean People's Army (KPA) Air and Anti-Air Force Unit 2620 honored with the Title of O Jung Hup-led 7th Regiment at an undisclosed location in North Korea. (Photo by AFP Photo/KCNA via KNS)

This undated picture released by North Korea's official Korean Central News Agency (KCNA) on March 22, 2014 shows North Korean leader Kim Jong-Un (C) during a visit to the Ryugyong Dental Hospital in Pyongyang. Meanwhile, North Korea test-fired 30 short-range missiles into the sea on March 22, South Korea's Joint Chiefs of Staff said, the latest in a series of launches despite calls from Seoul and Washington to stop “provocative actions”. (Photo by AFP Photo/KCNA via KNS)

This undated photo released by North Korea's official Korean Central News Agency (KCNA) on March 12, 2014 shows North Korean leader Kim Jong-Un (C) applauding after the performance by the art squads of soldiers during the 1st contest of the Korean People's Army art squads at an undisclosed location in North Korea. (Photo by AFP Photo/KCNA via KNS)

This undated picture released by North Korea's official Korean Central News Agency (KCNA) on March 22, 2014 shows North Korean leader Kim Jong-Un (centre R) meeting people during a visit to the Okryu children's hospital in Pyongyang. (Photo by AFP Photo/KCNA via KNS)

North Korean leader Kim Jong-Un (C) visits a building at a mini-golf course at the Rungna People's Pleasure Ground, which is nearing completion, in this undated picture released by the North's KCNA in Pyongyang on July 25, 2012. (Photo by Reuters/KCNA)

This undated picture released by North Korea's official Korean Central News Agency (KCNA) on March 22, 2014 shows North Korean leader Kim Jong-Un (centre R) being greeted during a visit to the Ryugyong Dental Hospital in Pyongyang. (Photo by AFP Photo/KCNA via KNS)

North Korean leader Kim Jong-Un (2nd R) visits Kyongsang Kindergarten in Pyongyang in this undated picture released by the North's KCNA July 15, 2012. (Photo by Reuters/KCNA)

North Korean leader Kim Jong Un is applauded during the first meeting of the airpersons of the Korean People's Army (KPA) in Pyongyang April 15, 2014, in this photo released by North Korea's Korean Central News Agency (KCNA) on April 20, 2014. (Photo by Reuters/KCNA)

North Korean leader Kim Jong Un receives applause as he supervises a flight drill of the KPA Air and Anti-Air Force Unit 2620, honored with the Title of O Jung Hup-led 7th Regiment, in this undated photo released by North Korea's Korean Central News Agency (KCNA) March 7, 2014. (Photo by Reuters/KCNA)

North Korean leader Kim Jong Un supervises a flight drill of the KPA Air and Anti-Air Force Unit 2620, honored with the Title of O Jung Hup-led 7th Regiment, in this undated photo released by North Korea's Korean Central News Agency (KCNA) March 7, 2014. (Photo by Reuters/KCNA)

North Korean leader Kim Jong Un supervises a flight drill of the KPA Air and Anti-Air Force Unit 2620, honored with the Title of O Jung Hup-led 7th Regiment, in this undated photo released by North Korea's Korean Central News Agency (KCNA) March 7, 2014. (Photo by Reuters/KCNA)

North Korean leader Kim Jong Un visits an orphanage in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang February 4, 2014. (Photo by Reuters/KCNA)

North Korean leader Kim Jong-un talks to children during a visit to the Pyongyang Myohyangsan Children's Camp situated at the foot of Mt. Myohyang in North Phyongan Province, in this photo released by North Korea's Korean Central News Agency (KCNA) on May 20, 2013. (Photo by Reuters/KCNA)

North Korean leader Kim Jong-Un (top C) poses with residents as he visits a military unit on an island in the most southwest of Pyongyang in this picture released by the North's official KCNA news agency in Pyongyang August 19, 2012. KCNA did not state precisely when the picture was taken. (Photo by Reuters/KCNA)

North Korean leader Kim Jong Un is seen as he guides the multiple-rocket launching drill of women's sub-units under KPA Unit 851, in this undated photo released by North Korea's Korean Central News Agency (KCNA) April 24, 2014. (Photo by Reuters/KCNA)

North Korean leader Kim Jong Un receives applause as he guides the multiple-rocket launching drill of women's sub-units under KPA Unit 851, in this undated photo released by North Korea's Korean Central News Agency (KCNA) April 24, 2014. (Photo by Reuters/KCNA)

North Korean leader Kim Jong Un is surrounded by some female participants of the first meeting of the airpersons of the Korean People's Army (KPA) during a photo-taking session in Pyongyang April 17, 2014, in this photo released by North Korea's Korean Central News Agency (KCNA) on April 20, 2014. (Photo by Reuters/KCNA)

North Korean leader Kim Jong Un visits participants of a national agriculture competition in this undated photo released by North Korea's Korean Central News Agency (KCNA) in February 10, 2014. (Photo by Reuters/KCNA)

North Korean leader Kim Jong Un visits an orphanage in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang in February 4, 2014. (Photo by Reuters/KCNA)