Place:Lithuanian Soviet Socialist, Soviet Union

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The Lithuanian Soviet Socialist Republic (Lithuanian SSR; ; ), also known as Soviet Lithuania or Lithuania, was one of the constituent republics of the USSR between 1940–1941 and 1944–1990. After 1946, its territory and borders mirrored those of today's Republic of Lithuania, with the exception of minor adjustments of the border with Belarus.

During World War II, the previously independent Republic of Lithuania was occupied by the Soviet army on 16 June 1940, in conformity with the terms of the 23 August 1939 Molotov–Ribbentrop Pact, and established as a puppet state on 21 July. Between 1941 and 1944, the German invasion of the Soviet Union caused its de facto dissolution. However, with the retreat of the Germans in 1944–1945, Soviet hegemony was re-established and continued for forty-five years. As a result, many western countries continued to recognize Lithuania as an independent, sovereign de jure state subject to international law, represented by the legations appointed by the pre-1940 Baltic states, which functioned in various places through the Lithuanian Diplomatic Service.

On 18 May 1989, the Lithuanian SSR declared itself to be a sovereign state, though still part of the USSR. On 11 March 1990, the Republic of Lithuania was re-established as an independent state, the first Soviet Republic to leave Moscow and leading other states to do so. Considered illegal by the Soviet authorities, the country was recognized by western powers immediately prior to the breakup of the Soviet Union. The Soviet Union itself recognized Lithuanian independence on 6 September 1991.

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