U.S. Secretary of Defense Ashton Carter (L) shakes hands with Japan's Prime Minister Shinzo Abe at the start of their meeting at Abe's official residence in Tokyo, Japan, 08 April 2015. Carter kicked off his first Asian tour on Wednesday with a stern warning against the militarisation of territorial rows in a region where China is at odds with several nations in the East and South China Seas. REUTERS/Franck Robichon/Pool