Chinese naval vessel attends the exercise of rescue of hijacked vessel during the "Joint Sea-2013" drill at Peter the Great Bay in Russia, July 9, 2013. Chinese and Russian warships carried out a variety of exercises including joint air defense, maritime supply, joint escort and the rescue of hijacked vessels during the second day of "Joint Sea-2013" drill. [Photo/Chinanews.com] 

Chinese naval vessel attends the exercise of rescue of hijacked vessel during the "Joint Sea-2013" drill at Peter the Great Bay in Russia, July 9, 2013. Chinese and Russian warships carried out a variety of exercises including joint air defense, maritime supply, joint escort and the rescue of hijacked vessels during the second day of "Joint Sea-2013" drill. [Photo/Chinanews.com] 

Chinese naval vessel attends the exercise of rescue of hijacked vessel during the "Joint Sea-2013" drill at Peter the Great Bay in Russia, July 9, 2013. Chinese and Russian warships carried out a variety of exercises including joint air defense, maritime supply, joint escort and the rescue of hijacked vessels during the second day of "Joint Sea-2013" drill. [Photo/Chinanews.com] 

Chinese naval vessel attends the exercise of rescue of hijacked vessel during the "Joint Sea-2013" drill at Peter the Great Bay in Russia, July 9, 2013. Chinese and Russian warships carried out a variety of exercises including joint air defense, maritime supply, joint escort and the rescue of hijacked vessels during the second day of "Joint Sea-2013" drill. [Photo/Chinanews.com] 

Chinese naval vessel attends the exercise of rescue of hijacked vessel during the "Joint Sea-2013" drill at Peter the Great Bay in Russia, July 9, 2013. Chinese and Russian warships carried out a variety of exercises including joint air defense, maritime supply, joint escort and the rescue of hijacked vessels during the second day of "Joint Sea-2013" drill. [Photo/Chinanews.com] 

Commanders of Chinese naval fleet attend the "Joint Sea-2013" drill at Peter the Great Bay in Russia, July 9, 2013. Chinese and Russian warships carried out a variety of exercises including joint air defense, maritime supply, joint escort and the rescue of hijacked vessels during the second day of "Joint Sea-2013" drill. [Photo/Xinhua]

A Russian ship-borne helicopter takes off from a Chinese naval vessel during the "Joint Sea-2013" drill at Peter the Great Bay in Russia, July 9, 2013. Chinese and Russian warships carried out a variety of exercises including joint air defense, maritime supply, joint escort and the rescue of hijacked vessels during the second day of "Joint Sea-2013" drill. [Photo/Xinhua]

Chinese and Russian warships carried out a variety of exercises including joint air defense, maritime supply, joint escort and the rescue of hijacked vessels during the second day of "Joint Sea-2013" drill. [Photo/Xinhua]

Zhang Changlong, Captain of guided-missile destroyer Shenyang, attends the "Joint Sea-2013" drill at Peter the Great Bay in Russia, July 9, 2013. Chinese and Russian warships carried out a variety of exercises including joint air defense, maritime supply, joint escort and the rescue of hijacked vessels during the second day of "Joint Sea-2013" drill. [Photo/Xinhua]

Chinese naval vessel attends the exercise of rescue of hijacked vessel during the "Joint Sea-2013" drill at Peter the Great Bay in Russia, July 9, 2013. Chinese and Russian warships carried out a variety of exercises including joint air defense, maritime supply, joint escort and the rescue of hijacked vessels during the second day of "Joint Sea-2013" drill. [Photo/Xinhua] 

Chinese naval vessel attends the exercise of rescue of hijacked vessel during the "Joint Sea-2013" drill at Peter the Great Bay in Russia, July 9, 2013. Chinese and Russian warships carried out a variety of exercises including joint air defense, maritime supply, joint escort and the rescue of hijacked vessels during the second day of "Joint Sea-2013" drill. [Photo/Xinhua] 

Chinese naval vessel attends the exercise of rescue of hijacked vessel during the "Joint Sea-2013" drill at Peter the Great Bay in Russia, July 9, 2013. Chinese and Russian warships carried out a variety of exercises including joint air defense, maritime supply, joint escort and the rescue of hijacked vessels during the second day of "Joint Sea-2013" drill. [Photo/Xinhua] 

Chinese naval vessel attends the exercise of rescue of hijacked vessel during the "Joint Sea-2013" drill at Peter the Great Bay in Russia, July 9, 2013. Chinese and Russian warships carried out a variety of exercises including joint air defense, maritime supply, joint escort and the rescue of hijacked vessels during the second day of "Joint Sea-2013" drill. [Photo/Xinhua]