bild

File -- In a June 29, 2007 file photo China's President Hu Jintao smiles after arrival to Hong Kong airport. Chinese President Hu Jintao will attend a summit on nuclear security in the United States this month, the Foreign Ministry said Thursday, April 1, 2010, signaling an easing of strained relations between the countries. (KEYSTONE/AP Photo/Kin Cheung/file)