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
Russia and the United Nations collapsed in late 1991. Eleven of the twelve members of the Commonwealth of Independent States signed a declaration on December 21, 1991, agreeing that "Member states of the Commonwealth support Russia in taking over the USSR membership in the UN, including permanent membership in the Security Council." One day before the resignation of Soviet President Mikhail Gorbachev, Ambassador Y. Vorontsov transmitted to the UN Secretary-General Javier Pérez de Cuéllar a letter from President of the Russian Federation Boris Yeltsin stating that: The Secretary-General circulated the request among the UN membership. There being no objection, the Russian Federation took the USSR's