The region was combined togerther twice â `` during the Russian Civil War ( Transcaucasian Democratic Federative Republic ) from 9 April 1918 to 26 May 1918 , and under the Soviet rule ( Transcaucasian SFSR ) from 12 March 1922 to 5 December 1936 . The region was unified as a single political entity twice â `` during the Russian Civil War ( Transcaucasian Democratic Federative Republic ) from 9 April 1918 to 26 May 1918 , and under the Soviet rule ( Transcaucasian SFSR ) from 12 March 1922 to 5 December 1936 .