premise: The Latvian Soviet Socialist Republic is still a republic of the Union of Soviet Socialist Republics.
hypothesis: The Latvian Soviet Socialist Republic ( Latvian SSR ; Latvijas Padomju Sociālistiskā Republika Латвийская Советская Социалистическая Республика , Latviyskaya Sovetskaya Sotsialisticheskaya Respublika ) , also known as Soviet Latvia or Latvia , was a republic of the Soviet Union . The full independence of the Republic of Latvia was restored on 21 August 1991 , during the 1991 Soviet coup d'état attempt and fully recognized by the Soviet Union on 6 September 1991 .