Amid acute tensions with North Korea, the United States and South Korea on Sunday began collective aggressive exercises.The aggressive exercises, dubbed Invincible Spirit, are appointed to run through Wednesday in amnion off South Korea to authenticate the alliance's resolve. In accession to the 8,000 cadre involved, aggressive admiral say, the contest will accommodate 20 ships and submarines and about 200 aircraft.The U.S. Defense Department said the drills are in acknowledgment to the biconcave of the South Korean warship Cheonan and are advised to accelerate a able bulletin to Pyongyang to stop "provocative and aggressive acts.The drills will accommodate anti-sub aggression exercises, said Cmdr. Jeff Davis of the U.S. 7th Fleet.The anti-sub-infiltration exercise works like this: if a sub is advancing in to advance a ship, the aggressive finds it and prosecutes it," he said.Davis said there was a "renewed desire" and coercion to focus on the exercise afterwards the Cheonan sinking.
