Chinese President Hu Jintao speaks during a luncheon for corporate and policy leaders co-hosted by the U.S.-China Business Council and the National Committee on U.S.-China Relations in Washington on Thursday, at the end of his visit to the U.S. capital. Saul Loeb/AFP/Getty Images hide caption

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U.S. Defense Secretary Robert Gates and Gen. Xu Caihou, vice chairman of China's Central Military Commission, meet in Beijing on Tuesday. Gates is holding talks with China's political and military leaders during the visit, which comes ahead of a second summit between President Obama and China's President Hu Jintao later this month. Pool/Getty Images hide caption

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Richard Holbrooke, U.S. special representative to Afghanistan and Pakistan, takes part in a discussion on international security in Passau, Germany, on Nov. 12. hide caption

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South Korean Gen. Han Min-koo looks at houses destroyed by North Korea's Nov. 23 shelling of Yeonpyeong Island. Two weeks after the attack, the rivals are still trading threats, while tensions are also rising between South Korea's ally, the U.S., and China, an ally of North Korea. Kim Ju-sung/AP/Yonhap hide caption

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The leaked WikiLeaks cables highlight two pervasive challenges the U.S. faces in Afghanistan: corruption and dealing with President Hamid Karzai. Shah Marai/Getty Images hide caption

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Private security contractors guard a part of a route as NATO supply trucks drive past in the province of Ghazni, southwest of Kabul. Intense negotiations continued between Afghan President Hamid Karzai and the international community over the Afghan government's deadline for ridding the nation of private security guards. Rahmatullah Naikzad/AP hide caption

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Members of the peace council listen to Afghan President Hamid Karzai speak during an inaugural meeting at the Presidential Palace in Kabul on Oct. 7. Shah Marai/AFP/Getty Images hide caption

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Pakistani security personnel stand beside trucks carrying NATO supplies at Torkham, the main border crossing in Pakistan's Khyber district, on Oct. 1. Pakistan halted the convoys on Sept. 30 after officials blamed cross-border NATO helicopter fire for the deaths of three Pakistani soldiers. A. Majeed/AFP/Getty Images hide caption

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Sgt. 1st Class Phillip Carroll, with the 101st Airborne Division, patrols in the Arghandab River valley outside Kandahar, Afghanistan, this week. Debate in Washington is growing over the scope and duration of continued U.S. military operations in Afghanistan. David Gilkey/NPR hide caption

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Pakistani flood survivors wait to board a U.S. military transport helicopter to evacuate the Kalam Valley on Monday. Farooq Naeem/AFP/Getty Images hide caption

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President Obama meets with Palestinian President Mahmoud Abbas at the White House in June. Charles Dharapak/AP hide caption

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Cambodian farmer Leang Korn, 56, cries in front of a portrait of her nephew, who was a prisoner of the Khmer Rouge's Tuol Sleng prison, now turned into a genocide museum, in Phnom Penh, Cambodia. Heng Sinith/AP hide caption

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U.S. Marines take cover as they are involved in a gun battle in March during a patrol in Marjah, Afghanistan. In February, U.S.-led troops set out to rid the area of insurgents and set up a viable local government. But Taliban militants have returned to the area. Dusan Vranic/AP hide caption

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