Byelorussian SSR in the context of "Polish–Soviet War"

The Declaration and Treaty on the Formation of the Union of Soviet Socialist Republics (Russian: Декларация и договор об образовании Союза Советских Социалистических Республик) officially created the Union of Soviet Socialist Republics (USSR), commonly known as the Soviet Union. It de jure legalised a political union of several Soviet republics that had existed since 1919 and created a new federal government whose key functions were centralised in Moscow. Its legislative branch consisted of the Congress of Soviets of the Soviet Union and the Central Executive Committee of the Soviet Union (TsIK), while the Council of People's Commissars composed the executive.

The Treaty, along with the Declaration of the Creation of the USSR was approved on 30 December 1922 by a conference of delegations from the Russian SFSR, the Transcaucasian SFSR, the Ukrainian SSR and the Byelorussian SSR. The Treaty and the Declaration were confirmed by the First All-Union Congress of Soviets and signed by heads of delegations – Mikhail Kalinin, Mikhail Tskhakaya, and Grigory Petrovsky, Alexander Chervyakov respectively on December 30, 1922. The treaty provided flexibility to admit new members. Therefore, by 1940 the Soviet Union grew from the founding four (or six, depending on whether 1922 or 1940 definitions are applied) republics to 16 republics.

The Commonwealth of Independent States (CIS) is a regional intergovernmental organisation in Eurasia. It was formed following the dissolution of the Soviet Union in 1991. It covers an area of 20,368,759 km (7,864,422 sq mi) and has an estimated population of 246,200,194. The CIS encourages cooperation in economic, political, and military affairs and has certain powers related to the coordination of trade, finance, lawmaking, and security, including the prevention of cross-border crime.

As the Soviet Union disintegrated, Belarus, Russia, and Ukraine signed the Belovezha Accords on 8 December 1991, declaring that the Union had effectively ceased to exist and proclaiming the CIS in its place. On 21 December, the Alma-Ata Protocol was signed, but Estonia, Latvia, and Lithuania chose not to participate. Georgia withdrew its membership in 2008 following a war with Russia. Ukraine formally ended its participation in CIS statutory bodies in 2018, although it had stopped participating in the organisation in 2014 following the Russian annexation and occupation of Crimea. In the aftermath of the 2022 Russian invasion of Ukraine, Moldova voiced its intention to progressively withdraw from the CIS institutional framework.

The 1st Belorussian Front (Russian: Пéрвый Белорусский фронт, Pervyy Belorusskiy front, also romanized "Byelorussian"), known without a numeral as the Belorussian Front between October 1943 and February 1944, was a major formation of the Red Army during World War II, being equivalent to a Western army group. Alongside the 1st Ukrainian Front, it was the largest and most powerful among all Soviet fronts, as their main effort was to capture Berlin, the capital of Nazi Germany.

The 2nd Belorussian Front (Russian: Второй Белорусский фронт, Vtoroi Belorusskiy front, also romanized "Byelorussian"), was a major formation of the Soviet Army during World War II, being equivalent to a Western army group.

It was created in February 1944 as the Soviets were pushing the Germans back towards Byelorussia. General Colonel Pavel Kurochkin was its first commander. On hiatus in April 1944, its headquarters were reformed from the army headquarters of the disbanding 10th Army. They took part in the capture of Berlin, the capital of Nazi Germany.