North Korea has a track record of launching surprise provocations and scrapping cooperation projects with South Korea when it fails to win concessions. It canceled family reunions at the last minute in September when it accused Seoul of preparing war drills and other hostile acts.
On Thursday, U.S. Secretary of State John Kerry and his South Korean counterpart Yun Byung-se warned North Korea against any possible aggression, saying it should not use the military exercises as an excuse to stay away from talks or to delay attempts to improve ties.
Associated Press Writer Edith M. Lederer contributed to this report from the United Nationspot
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