SKOREA-US-NKOREA-MILITARY

South Korean policemen wearing gas masks move to a position during an anti-terrorism drill as part of a joint US-South Korean military exercise called Ulchi Freedom Guardian at a subway station in Seoul on August 21, 2012. The South Korean and US militaries have begun a major annual joint exercise to test defences against North Korea, with Pyongyang denouncing the drill and vowing to strengthen its nuclear deterrent. AFP PHOTO / JUNG YEON-JE