US Secretary of State Rex Tillerson (C) poses for a photograph with US Gen. Vincent K. Brooks (R), commander of the United Nations Command, Combined Forces Command and United States Forces Korea, and deputy Commander of the Combined Force Command General Leem Ho-young (L) as two North Korean soldiers (top) look on at the border village of Panmunjom, which has separated the two Koreas since the Korean War, on March 17, 2017. Washington's top diplomat visited the Demilitarised Zone dividing the two Koreas to gaze on the North for himself on March 17, a day after he declared 20 years of efforts to denuclearise it had failed. / AFP PHOTO / POOL / Lee Jin-man (Photo credit should read LEE JIN-MAN/AFP/Getty Images)