1/9South Korean soldiers patrol along a barbed-wire fence, near the demilitarized zone that separates the two Koreas in Paju, north of Seoul, April 5, 2013.
An official at Russia's embassy in the North Korean capital says Pyongyang has suggested Russia consider evacuating its embassy staff due to rising tensions on the Korean peninsula.
2/9A couple looks at a map showing the demilitarized zone that separates the two Koreas, at the Imjingak pavilion in Paju, north of Seoul, April 5, 2013.
An official at Russia's embassy in the North Korean capital says Pyongyang has suggested Russia consider evacuating its embassy staff due to rising tensions on the Korean peninsula.
3/9U.S. Army Patriot missile air defence artillery batteries are seen at U.S. Osan air base in Osan, south of Seoul, April 5, 2013.
An official at Russia's embassy in the North Korean capital says Pyongyang has suggested Russia consider evacuating its embassy staff due to rising tensions on the Korean peninsula.
4/9South Korean soldiers take part in military training near the demilitarized zone separating the two Koreas in Paju, north of Seoul, April 4, 2013.
An official at Russia's embassy in the North Korean capital says Pyongyang has suggested Russia consider evacuating its embassy staff due to rising tensions on the Korean peninsula.
5/9U.S. soldiers wear gas masks while attending a demonstration of their equipment during a ceremony to recognize the battalion's official return to the 2nd Infantry Division based in South Korea at Camp Stanley in Uijeongbu, north of Seoul, April 4, 2013.
An official at Russia's embassy in the North Korean capital says Pyongyang has suggested Russia consider evacuating its embassy staff due to rising tensions on the Korean peninsula.
6/9South Korean vehicles turn back after being refused entry to Kaesong, North Korea, April 3, 2013.
An official at Russia's embassy in the North Korean capital says Pyongyang has suggested Russia consider evacuating its embassy staff due to rising tensions on the Korean peninsula.
7/9Anti-war protesters raise signs during a rally denouncing the joint military drills between the South Korea and the United States near the U.S. Embassy in Seoul, South Korea, April 3, 2013.
An official at Russia's embassy in the North Korean capital says Pyongyang has suggested Russia consider evacuating its embassy staff due to rising tensions on the Korean peninsula.
8/9North Koreans attend a rally against the United States and South Korea in Nampo, North Korea, April 3, 2013.
An official at Russia's embassy in the North Korean capital says Pyongyang has suggested Russia consider evacuating its embassy staff due to rising tensions on the Korean peninsula.
9/9North Korean leader Kim Jong Un presides over a plenary meeting of the Central Committee of the Workers' Party of Korea in Pyongyang March 31, 2013 in this picture released by the North's official KCNA news agency.
An official at Russia's embassy in the North Korean capital says Pyongyang has suggested Russia consider evacuating its embassy staff due to rising tensions on the Korean peninsula.
