Tensions are at their highest in years, with the North and the U.S.-backed South demonstrating their military preparedness.
Tensions Remain High on Korean Peninsula

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North Koreans attend a rally in support of North Korean leader Kim Jong-un's order to put its missile units on standby in preparation for a possible war against the U.S. and South Korea, Pyongyang, March 29, 2013.

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University students punch the air as they march through Kim Il Sung Square in downtown Pyongyang, North Korea, March 29, 2013.

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South Korean soldiers prepare for a military exercise, Paju, north of Seoul, South Korea, March 29, 2013.

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A U.S. Air Force B-2 stealth bomber flies near Osan U.S. Air Base in Pyeongtaek, south of Seoul, South Korea, March 28, 2013.