US, Allies Stage Drills as N. Korea Warns of Security Crisis

seoul, south korea - The United States, South Korea and Japan conducted a joint missile defense exercise Monday aimed at countering North Korea's growing nuclear arsenal, as a top North Korean army official warned the U.S. that it risks "a clearer security crisis and insurmountable threats."

Last week, North Korea conducted one of its most provocative weapons demonstrations in years by flight-testing for the firs