Hu Jintao

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President George W. Bush welcomes Chinese President Hu Jintao in a South Lawn arrival ceremony in April 2006. Mr. Hu was disappointed to have lunch with the president instead of a state dinner. (Associated Press)

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U.S. Secretary of Defense Robert M. Gates (left front) listens to Chinese President Hu Jintao during a meeting Tuesday at the Great Hall of the People in Beijing. Mr. Hu visits the U.S. later this month. (Associated Press)

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U.S. Secretary of Defense Robert M. Gates (left) meets with Chinese President Hu Jintao at the Great Hall of the People in Beijing on Tuesday, Jan. 11, 2011. (AP Photo/Larry Downing, Pool)

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U.S. Secretary of Defense Robert Gates, left, shakes hands with Chinese President Hu Jintao before a meeting at the Great Hall of the People in Beijing on Tuesday, Jan. 11, 2011. (AP Photo/Larry Downing, Pool)

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U.S. Secretary of Defense Robert M. Gates, left, listens to Chinese President Hu Jintao during a meeting at the Great Hall of the People in Beijing on Tuesday, Jan. 11, 2011. (AP Photo/Larry Downing, Pool)

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**FILE** President Obama welcomes Chinese President Hu Jintao as he arrives for a Group of 20 summit dinner in Pittsburgh in September 2009. (Associated Press)

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French President Nicolas Sarkozy welcomes Chinese President Hu Jintao at the Orly airport, south of Paris, on Thursday. The three-day state visit by Mr. Hu marks a dramatic turnaround from the tense ties of two years ago, when Mr. Sarkozy threatened to boycott the opening ceremony of the Beijing Olympics out of anger about China's treatment of Tibet. (Associated Press)

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Chinese Vice President Xi Jinping, here in 2007, has been promoted to a key position in the Communist Party's military commission, indicating that he will succeed President Hu Jintao. (Associated Press)

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In this image made on Monday, Aug. 30, 2010, from China Central Television footage, North Korea's Kim Jong-il (third from left) applauds with Chinese President Hu Jintao (right) during a banquet in Changchun, in northeast China's Jilin province, on Friday, Aug. 27, 2010. (AP Photo/CCTV via APTN)

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South Koreans watch a TV broadcasting file footage of North Korean leader Kim Jong-il, left, meeting with Chinese President Hu Jintao, at a railway station in Seoul, South Korea, Thursday, Aug. 26, 2010. News reports say Mr. Kim may have traveled to China in what would be his second visit to the country this year.(AP Photo/Ahn Young-joon)

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South Koreans watch a TV broadcasting file footage of North Korean leader Kim Jong-il, center left, accompanied by Chinese President Hu Jintao, center, in their meeting, at a railway station in Seoul, South Korea, Thursday, Aug. 26, 2010. News reports say Mr. Kim may have traveled to China in what would be his second visit to the country this year.(AP Photo/Ahn Young-joon)

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Pakistani President Asif Ali Zardari, second right, and Chinese President Hu Jintao, right, shake hands while Zardari's daughters stand beside at the Great Hall of the People in Beijing, China, Wednesday, July 7, 2010. Pakistan President Asif Ali Zardari appealed Wednesday to Chinese business leaders for help in developing his country's ailing energy sector, pointing to nuclear power as one area of growth but making no public mention of a deal with China that has alarmed the U.S. and others. (AP Photo/Alexander F. Yuan, Pool)

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**FILE** President Obama stands at attention with Chinese President Hu Jintao at the Great Hall of the People in Beijing on Nov. 17, 2009. (Associated Press)