South Korean soldiers

South Korean soldiers use a pair of binoculars to look at the North Korean side during a troop information and education activity from the Dora observation post near the demilitarised zone (DMZ) separating the two Koreas in Paju, about 55 km (34 miles) north of Seoul, May 27, 2009. North Korea, facing international sanction for this week's nuclear test, threatened on Wednesday to attack the South after Seoul joined a U.S.-led initiative to check vessels suspected of carrying equipment for weapons of mass destruction.

REUTERS/Kim Kyung-Hoon Wed May 27, 4:04 AM