U.S. and South Korean marines participate in a U.S.-South Korea joint landing operation drill in Pohang, South Korea, in this March 31, 2014 file picture. South Korean and U.S. troops began large-scale military exercises on March 7, 2016 in an annual test of their defenses against North Korea, which called the drills “nuclear war moves” and threatened to respond with an all-out offensive. (Photo by Kim Hong-Ji/Reuters)
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