กองทัพสหรัฐและเกาหลีใต้เตรียมพร้อมรับมือภัยคุกคามจากเกาหลีเหนือ

People take part in an oath-taking before the statues of late North Korean leaders Kim Il-sung and Kim Jong-il on Mansudae Hill in Pyongyang, April 10, 2013. (KCNA)

Anti-North Korean protesters release balloons with peace messages on the Grand Unification Bridge leading to the North near the demilitarised zone separating the two Koreas, in Paju, north of Seoul, April 10, 2013.

South Koreans arrive with their belongings from North Korea's Kaesong at the customs, immigration and quarantine office near the border village of Panmunjom, in Paju, north of Seoul, South Korea, April 9, 2013.

Visitors look at the industrial complex in Kaesong, North Korea, through binoculars at Dora Observation Post in the demilitarized zone (DMZ) near the border village of Panmunjom, in Paju, South Korea, April 9, 2013.

North Koreans stand along a highway leading to Pyongyang, April 9, 2013.

A South Korean military vehicle passes by gates leading to the North Korean city of Kaesong at the customs, immigration and quarantine office near the border village of Panmunjom, April 8, 2013.

An elementary school teacher orders her students to leave as they watch South Korean housewives denounce annual South Korean-U.S. military exercises, near the U.S. Embassy in Seoul, April 8, 2013.

South Korean army soldiers patrol along a barbed-wire fence near the border village of the Panmunjom, in Paju, South Korea, April 8, 2013.

North Korean military dogs run to a target with a portrait of South Korean Defence Minister Kim Kwan-jin during a military drill, April 6, 2013. (KCNA)