South Korean marines perform a martial art during a ceremony to commemorate the 5th anniversary of North Korea's shelling of Yeonpyeong Island at the War Memorial in Seoul on November 23, 2015. North Korea warned of "merciless" attacks on South Korean border islands if Seoul stages live-fire drills near the maritime border on the fifth anniversary of Pyongyang's deadly shelling attack. (Photo by Jung Yeon-Je/AFP Photo)
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