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PANMUNJOM, SOUTH KOREA - JANUARY 09: South Korean Unification Minister Cho Myoung-gyon (L) shakes hands with the head of North Korean delegation Ri Son-Gwon (R) before their meeting at the Panmunjom in the Demilitarized Zone on January 9, 2018 in Panmunjom, South Korea. South and North Korea are scheduled to begin their first official face-to-face talks in two years on Tuesday, January 9, 2017. (Photo by Korea Pool/Getty Images)

PANMUNJOM, SOUTH KOREA - JANUARY 09: South Korean Unification Minister Cho Myoung-gyon (L) shakes hands with the head of North Korean delegation Ri Son-Gwon (R) before their meeting at the Panmunjom in the Demilitarized Zone on January 9, 2018 in Panmunjom, South Korea. South and North Korea are scheduled to begin their first official face-to-face talks in two years on Tuesday, January 9, 2017. (Photo by Korea Pool/Getty Images)

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Kim Il Sung Square in Pyongyang

Kim Il Sung Square in Pyongyang

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North Korean Soldiers at Panmunjom

North Korean Soldiers at Panmunjom

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SEOUL, SOUTH KOREA - MAY 2: A stack of scrapped missiles, the South Korean Nike (L, back), the US Hawk (front) and the North Korean Scud (C, back) displayed at a war museum on May 2, 2005 in Seoul, South Korea. North Korea apparently test fired a missile into the Sea of Japan raising new fears about Pyongyang's nuclear intentions just days after a U.S. intelligence official said the secretive Stalinist state had the ability in theory to arm a missile with a nuclear warhead. (Photo by Chung Sung-Jun/Getty Images)

SEOUL, SOUTH KOREA - MAY 2: A stack of scrapped missiles, the South Korean Nike (L, back), the US Hawk (front) and the North Korean Scud (C, back) displayed at a war museum on May 2, 2005 in Seoul, South Korea. North Korea apparently test fired a missile into the Sea of Japan raising new fears about Pyongyang's nuclear intentions just days after a U.S. intelligence official said the secretive Stalinist state had the ability in theory to arm a missile with a nuclear warhead.  (Photo by Chung Sung-Jun/Getty Images)

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SEOUL, SOUTH KOREA - JANUARY 06: South Korean watch a television broadcast reporting the North Korea's Hydrogen Bomb Test at the Seoul Railway Station on January 6, 2016 in Seoul, South Korea. North Korea confirmed it has conducted a hydrogen bomb test after South Korea's Metrological Administration detected an 'artificial earthquake' near Punggye-ri, North Korea's main nuclear testing site on January 6, 2015. (Photo by Chung Sung-Jun/Getty Images)

SEOUL, SOUTH KOREA - JANUARY 06:  South Korean watch a television broadcast reporting the North Korea's Hydrogen Bomb Test at the Seoul Railway Station on January 6, 2016 in Seoul, South Korea. North Korea confirmed it has conducted a hydrogen bomb test after South Korea's Metrological Administration detected an 'artificial earthquake' near  Punggye-ri, North Korea's main nuclear testing site on January 6, 2015.  (Photo by Chung Sung-Jun/Getty Images)