Sudan

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Andrew Natsios, the president’s special envoy for Sudan, gestures during a press briefing on Darfur and the U.S.-imposed sanctions, on Tuesday, May 29, 2007, at the State Department in Washington. (Associated Press)

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**FILE** Sudanese armed forces ride a military vehicle April 24, 2012, at the oil-rich border town of Heglig, Sudan. (Associated Press)

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Sudanese President Omar Bashir is condemned by South Sudan's chief negotiator as not a man of peace. “He is a warmonger and a racist, and someone who is calling for genocide.” (Associated Press)

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Residents try to extinguish fires in the smoldering remains of a market in Rubkona near Bentiu in South Sudan after an attack by Sudanese aircraft on April 23. A massive humanitarian crisis, triggered by the conflict and heightened by an approaching rainy season, is threatening the lives of hundreds of thousands of people along the Sudan-South Sudan border. (Associated Press)

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** FILE ** Sudanese armed forces ride a military vehicle in the oil-rich border town of Heglig, Sudan, on Tuesday, April 24, 2012. (AP Photo/Abd Raouf)

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GRAPHIC: A look at the issues in the dispute between Sudan and South Sudan. (The Washington Times)

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Sudanese state Minister of Information Sana Hamad poses April 24, 2012, for a photo with Sudanese armed forces at the oil-rich border town of Heglig, Sudan. (Associated Press)

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Sudanese armed forces ride in a military vehicle at the oil-rich border town of Heglig, Sudan, on Tuesday, April 24, 2012. (AP Photo/Abd Raouf)

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South Sudanese President Salva Kiir reviews an honor guard with Chinese President Hu Jintao during a welcoming ceremony at the Great Hall of the People in Beijing. The Obama administration has been working closely with Beijing to try to prevent a full-fledged war between Sudan and South Sudan, where bombs dropped overnight heightened tensions. (Associated Press)

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On the day he was welcomed at a ceremony in Beijing, South Sudanese President Salva Kiir said Sudan "has declared war" on his country. (Associated Press)