About 28,500 U.S. troops are stationed in South Korea in joint defense with the South`s forces against North Korea. The two Koreas are in a technical state of war under a truce after their 1950-53 Korean War.
On Monday, South Korea`s military conducted artillery live-fire drills on islands near a disputed maritime border with North Korea, ignoring Pyongyang`s threat to fire back if any of the shells landed in its waters.
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