North Korea

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**FILE** President Obama looks through binoculars toward North Korea from Observation Post Ouellette in the Demilitarized Zone, the tense military border between the two Koreas, in Panmunjom, South Korea, on March 25, 2012. With Mr. Obama is Lt. Col. Ed Taylor (right), commander of the U.N. Command Security Battalion-Joint Security Area. (Associated Press)

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A South Korean protester aims a toy gun at an effigy of North Korean leader Kim Jong-un, which is set on a mock North Korean missile during an anti-North Korea rally denouncing North's plan to launch a long-range rocket in Seoul on March, 20, 2012. (Associated Press)

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An effigy of North Korean leader Kim Jong-un is put on a mock North Korean missile during an anti-North Korea rally in Seoul on Tuesday, March 20, 2012, to denounce the North's plan to launch a long-range rocket. (Associated Press)

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Ri Yong-ho, North Korea's senior nuclear negotiator, speaks to journalists outside the Diaoyutai state guest house in Beijing on Monday, March 19, 2012. (AP Photo/Ng Han Guan)

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** FILE ** A rocket lifts off from the launch pad in Musudan-ri, North Korea, in April 2009. (AP Photo/KRT TV, File)

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Foreign visitors walk by displays of mock North Korea's Scud-B missile (right) and other South Korean missiles at Korea War Memorial Museum in Seoul on March 16, 2012. (Associated Press)

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The 2nd Corps of the Korean People's Army in North Korea conducts a live-fire exercise near North Korea's southwest coast on Monday, March 5, 2012. (AP Photo)

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North Korean Maj. Kwak Chol-hui, deputy director of the National Defense Commission, attends a news conference in Pyongyang, North Korea, on Saturday, March 3, 2012, to discuss the current joint U.S.-South Korean war games, which the North says threatens regional peace and stability. (AP Photo/Kim Kwang Hyon)

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**FILE** Residents walk Feb. 11, 2012, on a street in Pyongyang, North Korea, past posters with popular slogans illustrating North Korea's main policies. From left to right, they read, "Let's march toward a military first revolution," "Let's accomplish the tasks laid out in this year's joint new year's editorial," and "Devote the victors' hearts to the building of a strong nation." (Associated Press)

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Kim Kye-gwan (left), North Korea's first vice foreign minister, is greeted by Ri Yong-ho, a vice minister in the North's Ministry of Foreign Affairs, at Pyongyang's airport on Monday, Feb. 27, 2012. Mr. Ri, who is in charge of the North's nuclear negotiations, is heading to the United States next week on the heels of a breakthrough nuclear agreement with the U.S. (AP Photo)

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South Koreans gather in an underground shelter on Baengnyeong Island as the country's military began live-fire drills from front-line islands near its disputed sea border with North Korea on Monday, Feb. 20, 2012. (AP Photo/Yonhap)

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South Korean sailors in a speed boat patrol near the country's Yeonpyong Island after finishing military exercises near the disputed sea border with North Korea on Monday, Feb. 20, 2012. (AP Photo/Yonhap, Bae Jung-hyun)

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North Korean soldiers goose-step below a portrait of the late North Korean leader Kim Jong-il during a military parade at Kumsusan Memorial Palace in Pyongyang, North Korea, to commemorate Kim's 70th birthday on Thursday, Feb. 16, 2012. (AP Photo/David Guttenfelder)

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New North Korean leader Kim Jong-un waves at Kumsusan Memorial Palace in Pyongyang, North Korea, after reviewing a parade of thousands of soldiers to commemorate the 70th birthday of his late father, Kim Jong-il, on Thursday, Feb. 16, 2012. (AP Photo/David Guttenfelder)

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A new bronze statue depicting the late North Korean leader Kim Jong-il (right) and his father, Kim Il-sung, stands on the grounds of the Mansudae Art Studio after it was unveiled in Pyongyang, North Korea, on Tuesday, Feb. 14, 2012. (AP Photo/David Guttenfelder)

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Flanked by military officers, Mr. Kim watches an air drill at an undisclosed air base in North Korea. Military photo-ops like this seek to show citizens that their new leader is firmly in command of the country's most important institution, its 1.2 million-strong military.

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In this undated photo, North Korea's new leader, Kim Jong-un, greets students at Mangyongdae Revolutionary School in Pyongyang, North Korea, on the occasion of the Chinese New Year. Compared with his father, who preceded him as president, Mr. Kim is less aloof and more outgoing. (Associated Press)