NKorea issues trademark fiery rhetoric over US-SKorea drills

North Korea's military on Tuesday greeted the start of annual U.S.-South Korean military drills with its standard fiery threats, vowing "merciless retaliation" for exercises Pyongyang claims are an invasion rehearsal.North Korea routinely issues such warlike rhetoric or conducts weapons tests to respond to the U.S.-South Korean exercises. Tuesday's threat came as top U.S. generals, including Adm. Harry Harris, the commander of U.S. forces in the Pacific, visited South Korea. Ties between the Kor