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Soldiers of the Korean People's Army take part in the landing and anti-landing drills of KPA Large Combined Units 324 and 287 and KPA Navy Combined Unit 597 in the east coastal area in North Korea, March 25, 2013.

A North Korean soldier attends military training in an undisclosed location in this picture released by the North's official KCNA news agency, March 19, 2013.

North Korean leader Kim Jong-Un talks with generals as soldiers of the Korean People's Army take part in landing and anti-landing drills in eastern North Korea, March 25, 2013.

The North Korean shore as seen from South Korean island of Yeongpyeong.

North Korean soldiers attend military training in an undisclosed location in this picture released by the North's official KCNA news agency, March 19, 2013.

North Korea's artillery sub-units, whose mission is to strike Daeyeonpyeong island and Baengnyeong island of South Korea, conduct a live shell firing drill to examine war fighting capabilities in the western sector of the front line, March 14, 2013.

The air force and air defense artillery units of of the Korean People's Army conducts a drill of drone planes assaulting targets in a picture released by the North's official KCNA news agency, March 20, 2013.

Members of the United Nations Security Council vote to tighten sanctions on North Korea at the United Nations Headquarters in New York, March 7, 2013.

April 8, 2012: A soldier stands guard in front of the Unha-3 rocket sitting on a launch pad at the West Sea Satellite Launch Site, northwest of Pyongyang, North Korea.

North Koreans celebrate the successful launch of the Unha-3 (Milky Way 3) rocket at Kim Il Sung square in Pyongyang December 14, 2012. The sign reads: "Let's glorify dignity and honor of great people of Kim Il Sung and of Korea of Kim Jong Il in the world

Comparison of the UNHA-2 and UNHA-3 rocket flight paths