Russian President Vladimir Putin (front) arrives in Shanghai, east China, May 20, 2014. Putin arrived in Shanghai early Tuesday to start his state visit to China and attend the upcoming the fourth Summit of the Conference on Interaction and Confidence Building Measures in Asia. Photo: Xinhua

Russian President Vladimir Putin (L, front) is welcomed upon his arrival at the Hongqiao International Airport in Shanghai, east China, May 20, 2014. Putin arrived in Shanghai early Tuesday to start his state visit to China and attend the fourth Summit of the Conference on Interaction and Confidence Building Measures in Asia. Photo: Xinhua