North Korea threatens attack due to war drills By Jon Herskovitz Tue Aug 22, 5:34 AM ET North Korea said it had the right to launch a pre-emptive attack to counter a U.S.-South Korean joint military training drill, its official media reported on Tuesday. U.S. and South Korean troops began military exercises on Monday dubbed Ulchi Focus Lens that are aimed at testing command structures and communications. The annual exercises have been held without incident since they began in 1975 and the North usually brands them as a prelude to invasion and nuclear war. But the drills this year are...