South Korea kicked off its annual joint military exercises with the United States on Monday, despite vocal opposition from North Korea which will test a recent upswing in cross-border ties.
Beijing's military accused Tokyo of a "highly dangerous provocation" by interfering in Chinese live-fire drills in the Pacific last week, warning that Japanese lives could be at stake.
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North Korea on Tuesday warned the United States of a "horrible disaster" and put its troops on alert over a massive joint naval drill involving a nuclear-powered US aircraft carrier alongside South Korean and Japanese vessels.