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Quisling (/ˈkwɪzlɪŋ/, Norwegian pronunciation: [ˈkvɪ̂slɪŋ]) is a term used in Scandinavian languages and in English to mean a citizen or politician of an occupied country who collaborates with an enemy occupying force; it may also be used more generally as a synonym for traitor or collaborator.[1][2][3] The word originates from the surname of the Norwegian war-time leader Vidkun Quisling (1887–1945), who headed a domestic Nazi collaborationist regime during the Nazi occupation of Norway from 1940 to 1945, during the Second World War.

The island chain strategy is a strategic maritime containment plan first conceived by American foreign policy statesman John Foster Dulles in 1951, during the Korean War. It proposed surrounding the Soviet Union and China with naval bases in the West Pacific to project power and restrict sea access.

The "island chain" concept did not become a major theme in American foreign policy during the Cold War, but after the dissolution of the Soviet Union has remained a major focus of both American and Chinese geopolitical and military analysts to this day. For the United States, the island chain strategy is a significant part of the force projection of the U.S. military in the Far East. For the People's Republic of China (PRC), the concept is integral to its maritime security and fears of strategic encirclement by the U.S. and its allies. For both the U.S. and the PRC, the island chain strategy emphasizes the geographical and strategic importance of Taiwan.