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EAST COAST, SOUTH KOREA - SEPTEMBER 4: In this handout photo released by the South Korean Defense Ministry, South Korea's Hyunmu-2 ballistic missile is fired during an exercise aimed to counter North Korea's nuclear test on September 4, 2017 in East Coast, South Korea. South Korea's military said Monday it conducted a combined live-fire exercise in response to North Korea's sixth nuclear test a day earlier. (Photo by South Korean Defense Ministry via Getty Images)

EAST COAST, SOUTH KOREA - SEPTEMBER 4: In this handout photo released by the South Korean Defense Ministry, South Korea's Hyunmu-2 ballistic missile is fired during an exercise aimed to counter North Korea's nuclear test on September 4, 2017 in East Coast, South Korea. South Korea's military said Monday it conducted a combined live-fire exercise in response to North Korea's sixth nuclear test a day earlier.  (Photo by South Korean Defense Ministry via Getty Images)