A view of the Unification Platform of Dorasan station, the last station on the South Korean side close to Demilitarised Zone (DMZ) which bifurcates the Korean peninsula.

South Korean first lady Kim Jung-sook puts water from the crater lake as North Korean first lady Ri Sol Ju, second from left, watches on the Mount Paektu in North Korea.

South Korean President Moon Jae-in, second from right, and his wife Kim Jung-sook, right, stand with North Korean leader Kim Jong Un, second from left, and his wife Ri Sol Ju on th...

A convoy transporting South Korean President Moon Jae-in makes its way to Sunan International Airport in Pyongyang, North Korea.

North Koreans wave on a street as a convoy transporting South Korean President Moon Jae-in makes its way to Sunan International Airport in Pyongyang, North Korea.

South Korean President Moon Jae-in and North Korean leader Kim Jong Un raise their hands after watching the mass games performance of "The Glorious Country" at May Day Stadium in P...

In this image made from video provided by Korea Broadcasting System (KBS), South Korean President Moon Jae-in, left, and North Korean leader Kim Jong Un pose after signing documen...

North Korean leader Kim Jong-un, right, toasts with South Korean president Moon Jae-in during a welcome banquet in Pyongyang, North Korea.

Women wearing traditional dress fill the streets of Pyongyang, North Korea, to welcome South Korean President Moon Jae-in and North Korean leader Kim Jong Un passing by during a ca...

South Korean President Moon Jae-in and North Korean leader Kim Jong Un, right, wave during a welcoming ceremony at Sunan International Airport in Pyongyang in North Korea.

South Korean calligraphist Yeo Tae-myong writes calligraphy on the unification flag to celebrate the upcoming inter-Korean summit in Seoul, South Korea

Yoon Young-chan, a senior South Korean presidential secretary for public relations, watches from between photos of the summit meeting between South Korean President Moon Jae-in and...

North Korean military band members march during a peace parade held by foreign delegates invited to the celebration of North Korea's 70 anniversary in Pyongyang, North Korea.

North Koreans cheer for a peace parade held by foreign delegates invited to the celebration of North Korea's 70 anniversary in Pyongyang, North Korea.

North Korean students take part in a torch light march held in conjunction with the 70th anniversary of North Korea's founding day celebrations in Pyongyang, North Korea.

North Korean students take part in a torch light march held in conjunction with the 70th anniversary of North Korea's founding day celebrations in Pyongyang, North Korea.

Participants perform during the "Glorious Country" mass games held in conjunction with the 70th anniversary of North Korea's founding day in Pyongyang, North Korea.

Performers hold up cards to form patterns during the "Glorious Country" mass games held in conjunction with the 70th anniversary of North Korea's founding day in Pyongyang, North K...

Airplanes forming the number 70 fly in formation and fire flares during a parade for the 70th anniversary of North Korea's founding day in Pyongyang, North Korea. North Korea stage...

North Korean soldiers salute as others bow before the giant bronze statues of late North Korean leaders Kim Il Sung and his son Kim Jong Il during the anniversary of the end of Wor...