Warhead weight of an ASM) x Number of such missiles carried by a warship x Number of such warships in the navy It concluded the total firepower of the PLAN was 77 million strike-miles compared to 17 million strike-miles of the USN. Territorial disputes Spratly Islands dispute The Spratly Islands dispute is a territorial dispute over the ownership of the Spratly Islands, a group of islands located in the South China Sea. States staking claims to various islands are Brunei, Malaysia, the Philippines, Taiwan, Vietnam, and People's Republic of China. All except Brunei occupy some of the islands in dispute. The People's Republic of China conducted naval patrols in the Spratly Islands and established a permanent base. On 14 March 1988, Chinese and Vietnamese naval forces clashed over Johnson South Reef in the Spratly Islands, which involved three PLAN frigates. In February 2011, the Chinese frigate Dongguan fired three shots at Philippine fishing boats in the vicinity of . The shots were fired after the frigate instructed the fishing boats to leave, and one of those boats experienced trouble removing its anchor. In May 2011, the Chinese patrol boats attacked and cut the cable of Vietnamese oil exploration ships near Spratly islands. The incidence sparked several anti-China protests in Vietnam. In June 2011, the Chinese navy conducted three days of exercises, including live fire drills, in the disputed waters. This was widely seen as a warning to Vietnam, which had also conducted live fire drills near the Spratly Islands. Chinese patrol boats fired repeated rounds at a target on an apparently uninhabited island, as twin fighter jets streaked in tandem overhead. 14 vessels participated in the maneuvers, staging antisubmarine and beach landing drills aimed at "defending atolls and protecting sea lanes." In May 2013, the Chinese navy's three operational fleets deployed together for the first time since 2010. This combined naval maneuvers in the South China Sea coincided with the ongoing Spratly Islands dispute between China and the Philippines as well as deployment of the U.S. Navy's Carrier Strike Group Eleven to the U.S. Seventh Fleet. Senkaku Islands (Diaoyu) dispute The Senkaku Islands dispute concerns a territorial dispute over a group of uninhabited islands known as the Diaoyu Islands in China, the Senkaku Islands in Japan, and Tiaoyutai Islands in Taiwan. Aside from a 1945 to 1972 period of administration by the United States, the archipelago has been controlled by