Treaty on the Creation of the USSR 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 1st Congress of Soviets of the USSR and signed by heads of delegations Mikhail Kalinin, Mikhail Tskhakaya, Mikhail Frunze and Grigory Petrovsky, Aleksandr 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 republics to 15 republics. On 8 December 1991, Russian, Ukrainian and Belarusian Presidents signed the Belavezha Accords. The agreement declared
People's Commissariat for Posts and Telegraphs of the USSR of People's Commissars of the Union of Soviet Socialist Republics (CPC Union), elected by the Central Executive Committee of the Union for the term of the latter," and it would comprise the People's Commissar for Posts and Telegraphs. In the Council of People's Commissars of the Union republics, the People's Commissariat for Posts and Telegraphs had "an advisory capacity." Accordingly, after the formation of the Soviet Union, the People's Commissariat for Posts and Telegraphs of the USSR was created in 1923 instead of the similar agency of the RSFSR. Regulations on the new Commissariat were approved by the USSR Central