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PANMUNJOM, SOUTH KOREA - APRIL 27: North Korean leader Kim Jong Un (L) and South Korean President Moon Jae-in (R) cross back the military demarcation line to the south side after Moon crossing the border to north upon meeting for the Inter-Korean Summit April 27, 2018 in Panmunjom, South Korea. Kim and Moon meet at the border today for the third-ever inter-Korean summit talks after the 1945 division of the peninsula, and first since 2007 between then President Roh Moo-hyun of South Korea and Leader Kim Jong-il of North Korea. (Photo by Korea Summit Press Pool/Getty Images)

PANMUNJOM, SOUTH KOREA - APRIL 27:  North Korean leader Kim Jong Un (L) and South Korean President Moon Jae-in (R) cross back the military demarcation line to the south side after Moon crossing the border to north upon meeting for the Inter-Korean Summit April 27, 2018 in Panmunjom, South Korea. Kim and Moon meet at the border today for the third-ever inter-Korean summit talks after the 1945 division of the peninsula, and first since 2007 between then President Roh Moo-hyun of South Korea and Leader Kim Jong-il of North Korea. (Photo by Korea Summit Press Pool/Getty Images)