Chinese and Russian fleets fire main guns during a China-Russia naval joint drill at sea off south China's Guangdong Province, Sept. 18, 2016. Chinese and Russian fleets conducted weapon use on a sea area east of Zhanjiang in south China's Guangdong Province during the "Joint Sea 2016" drill on Sunday. (Photo/Xinhua)
Chinese frigate "Guangzhou" fires depth charge rockets during a China-Russia naval joint drill at sea off south China's Guangdong Province, Sept. 18, 2016. Chinese and Russian fleets conducted weapon use on a sea area east of Zhanjiang in south China's Guangdong Province during the "Joint Sea 2016" drill on Sunday. (Xinhua/Zha Chunming)
Chinese frigate "Guangzhou" fires secondary guns during a China-Russia naval joint drill at sea off south China's Guangdong Province, Sept. 18, 2016. Chinese and Russian fleets conducted weapon use on a sea area east of Zhanjiang in south China's Guangdong Province during the "Joint Sea 2016" drill on Sunday. (Photo/Xinhua)
A radar operator reports situation on Chinese frigate "Guangzhou" during a China-Russia naval joint drill at sea off south China's Guangdong Province, Sept. 18, 2016. Chinese and Russian fleets conducted weapon use on a sea area east of Zhanjiang in south China's Guangdong Province during the "Joint Sea 2016" drill on Sunday. (Photo/Xinhua)
Chinese frigate "Guangzhou" fires a main gun during a China-Russia naval joint drill at sea off south China's Guangdong Province, Sept. 18, 2016. Chinese and Russian fleets conducted weapon use on a sea area east of Zhanjiang in south China's Guangdong Province during the "Joint Sea 2016" drill on Sunday. (Photo/Xinhua)
Water columns soar high after Chinese frigate "Guangzhou" fires depth charge rockets during a China-Russia naval joint drill at sea off south China's Guangdong Province, Sept. 18, 2016. Chinese and Russian fleets conducted weapon use on a sea area east of Zhanjiang in south China's Guangdong Province during the "Joint Sea 2016" drill on Sunday. (Photo/Xinhua)
Chinese and Russian fleets fire main guns during a China-Russia naval joint drill at sea off south China's Guangdong Province, Sept. 18, 2016. Chinese and Russian fleets conducted weapon use on a sea area east of Zhanjiang in south China's Guangdong Province during the "Joint Sea 2016" drill on Sunday. (Photo/Xinhua)
Chinese and Russian fleets fire main guns during a China-Russia naval joint drill at sea off south China's Guangdong Province, Sept. 18, 2016. Chinese and Russian fleets conducted weapon use on a sea area east of Zhanjiang in south China's Guangdong Province during the "Joint Sea 2016" drill on Sunday. (Photo/Xinhua)