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YONGIN, SOUTH KOREA - AUGUST 21: In this handout photo released by the South Korean Presidential Blue House, South Korea's President Park Geun-Hye (C) is seen during her visit to the headquarters of Third Army on August 21, 2015, in Yongin, South Korea. The visit came as military tensions on the divided Korean peninsula soared following a rare exchange of artillery fire on August 20 that put the South Korean army on maximum alert. (Photo by South Korean Presidential Blue House via Getty Images)

YONGIN, SOUTH KOREA - AUGUST 21:  In this handout photo released by the South Korean Presidential Blue House, South Korea's President Park Geun-Hye (C) is seen during her visit to the headquarters of Third Army on August 21, 2015, in Yongin, South Korea. The visit came as military tensions on the divided Korean peninsula soared following a rare exchange of artillery fire on August 20 that put the South Korean army on maximum alert.  (Photo by South Korean Presidential Blue House via Getty Images)