File photo of Chinese Vice-President Xi holding a glass of red wine as he toasts at a dinner to mark the 40th anniversary of U.S. President Nixon's visit to China, in Beijing

 
File photo of Chinese Vice-President Xi holding a glass of red wine as he toasts at a dinner to mark the 40th anniversary of U.S. President Nixon
Chinese Vice-President Xi Jinping holds a glass of red wine as he toasts at a dinner, also attended by former U.S. secretary of state Henry Kissinger, to mark the 40th anniversary of U.S. President Richard Nixon's historic visit to China, in Beijing, in this January 16, 2012 file photo. REUTERS/David Gray/Files