North Korea warned the United States on Tuesday that it could face "merciless revenge" after ignoring warnings not to go ahead with an annual joint military exercise with South Korea, according to Pyongyang's official media."The U.S. will be wholly held accountable for the catastrophic consequences to be entailed by such reckless aggressive war maneuvers, as it chose a military confrontation with the DPRK," a spokesman for the Panmunjeom mission of the Korean People's Army said in a statement carried by the Korean Central News Agency.DPRK is the acronym of North Korea's formal name, the Dem…READ FULL ARTICLE