FILE - In this Nov. 27, 2017, file photo, North Korean soldiers look at the South side as a South Korean stands guard near the spot where a North Korean soldier crossed the border on Nov. 13 at the Panmunjom, in the Demilitarized Zone, South Korea. South Korea says on Thursday, Dec. 21, 2017, it has fired 20 rounds of warning shots as North Korean soldiers approached a military demarcation line at the border after their comrade defected to South Korea. (AP Photo/Lee Jin-man, File)
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