Following the signing of the Soviet-Lithuanian Treaty of 1920, in which Lithuania provided aid to the Soviets fighting against Poland, the Soviet Union recognized Lithuanian claims to the Vilnius Region.
The Soviet Union recognized Lithuanian claims to the Vilnius Region. This was following the signing of the Soviet-Lithuanian Treaty of 1920. Lithuania provided aid to the Soviets. Lithuania was fighting against Poland in the signing of the Soviet-Lithuanian Treaty of 1920.