The Russian Civil War continues: Emissaries from the Byelorussian Soviet Socialist Republic, the Russian Soviet Federated Socialist Republic, the Transcaucasian Socialist Federated Socialist Republic and the Ukrainian Soviet Socialist Republic sign the Declaration and Treaty on the Formation of the Union of Soviet Socialist Republics creating the U.S.S.R. (a.k.a. Soviet Union).
[added 6/25/2022]
Subsequent Events:
References:
Treaty on the Creation of the USSR – Wikipedia
en.wikipedia.org/wiki/Treaty_on_the_Creation_of_the_USSR