** FILE ** In this photo taken Thursday, July 4, 2013, Chinese supply ship Hongzehu, right, refuels the Chinese missile destroyer Shenyang, left, in the Sea of Japan. China and Russia conducted their largest-ever joint naval drills in the Sea of Japan in a sign of warming ties between the former Cold War rivals. (AP Photo)

** FILE ** In this photo taken Thursday, July 4, 2013, Chinese supply ship Hongzehu, right, refuels the Chinese missile destroyer Shenyang, left, in the Sea of Japan. China and Russia conducted their largest-ever joint naval drills in the Sea of Japan in a sign of warming ties between the former Cold War rivals. (AP Photo)