The Republic of China (ROC), commonly known as Taiwan, has full diplomatic relations with 13 of the 193 United Nations member states and with the Holy See (Vatican City). In addition to these relations, the ROC also maintains unofficial relations with 59 UN member states, one self-declared state (Somaliland), three territories (Guam, Hong Kong, and Macau), and the European Union via its representative offices and consulates under the One China principle. Taiwan has the 31st largest diplomatic network in the world with 110 offices. Historically, the ROC has required its diplomatic allies to recognise it as the sole legitimate government of "China" (competing for exclusive use of the name "China"), starting in the early 1970s when the ROC was replaced by the PRC as the recognised government of "China" in the UN following Resolution 2758 including its key position such as a permanent membership on the United Nations Security Council. But since the 1990s, its policy has changed into actively seeking dual recognition with the People's Republic of China (PRC). Many international organizations that the ROC participates in use alternative names, including "Chinese Taipei" at the International Olympic Committee. Historical context The ROC government participated in the 1943 Moscow Conference, the Dumbarton Oaks Conference, and the United Nations Conference on International Organization and was a charter member of the United Nations after participating in the alliance that won World War II. In 1949, the Nationalists lost the Chinese Civil War in mainland China and retreated to Taiwan, Penghu, Kinmen, and Matsu, forming a rump state. Despite the major loss of territory, the ROC continued to be recognized as the legitimate government of China by the UN and by many non-Communist states. American foreign policy 1950–1971 called for full recognition and support of the government of China in Taiwan. As the Korean War (1950–1953) broke out, Taiwan was not allowed to send military support to South Korea. However, the Truman Administration resumed economic and military aid to the ROC on Taiwan and neutralized the Taiwan Strait by United States Seventh Fleet to stop a Chinese Communist Party (CCP) invasion as well as a potential ROC's counter-invasion of the mainland. In 1954 a US-Taiwan military alliance was signed as a result of the American Cold War strategy in the Far East, in the determination not to allow Chiang Kai-shek's forces on Taiwan to attack China, thereby setting off another even larger war