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An anti-North Korean activist holds a de...An anti-North Korean activist holds a defaced North Korean flag as he stands on the Unification Bridge that leads to the Demilitarized Zone (DMZ) between North and South Korea in Paju on August 24, 2015. South Korea's president hardened her line with North Korea on August 24, demanding an unequivocal apology for recent provocations as the two rivals struggled to negotiate their way out of a dangerous military standoff

Ed Jones/AFP

An anti-North Korean activist holds a defaced North Korean flag as he stands on the Unification Bridge that leads to the Demilitarized Zone (DMZ) between North and South Korea in Paju on Monday

South Korean marines aim their machine guns after they landed on the beach during a landing exercise in Taean, South Korea, Monday, June 29, 2015. South Korean navy and marine held a joint landing drill on the west coast on Monday improving their military readiness to protect the Korean Peninsula

Ahn Young-joon/AP

South Korean marines aim their machine guns after they landed on the beach during a landing exercise in Taean, South Korea on Monday. South Korean navy and marine held a joint landing drill on the west coast on Monday improving their military readiness to protect the Korean Peninsula

Members of the South Korean special forces take part in a military drill in Yeongcheon, southeast of Seoul in this May 2, 2013 picture provided by Yonhap. The two Koreas remain technically at war under a mere truce that ended hostilities in their 1950-53 conflict and North Korea, angry at U.N. sanctions and joint South Korean-U.S. military drills, has threatened both countries with nuclear attack in recent weeks.

Han Jong-chan/Yonhap/Reuters

Members of the South Korean special forces take part in a military drill in Yeongcheon, southeast of Seoul. The two Koreas technically remain at war under a truce that ended hostilities in their 1950-1953 conflict. North Korea is angry at UN sanctions and joint South Korean-US military drills, and has recently threatened both countries with nuclear attack.