South Korean army's K-1 tanks move during a military exercise in Paju, South Korea, near the border with North Korea, Monday, Sept. 4, 2017. Following U.S. warnings to North Korea of a "massive military response," South Korea's military on Monday fired missiles into the sea to simulate an attack on the North's main nuclear test site a day after Pyongyang detonated its largest ever nuclear test explosion. (AP Photo/Ahn Young-joon)
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