The final round of the Soviet Union's collapse began on December 1, 1991. That day, a Ukrainian popular referendum resulted in 91 percent of Ukraine's voters voting to affirm the independence declaration passed in August and formally secede from the Union. The secession of Ukraine, long second only to Russia in economic and political power, ended any realistic chance of Gorbachev keeping the Soviet Union together even on a limited scale. The leaders of the three Slavic republics, Russia, Ukraine, and Belarus (formerly Byelorussia), agreed to discuss possible alternatives to the union.
On December 8, the leaders of Russia, Ukraine, and Belarus secretly met in Belavezhskaya Pushcha, in western Belarus, and signed the Belavezha Accords, which proclaimed the Soviet Union had ceased to exist and announced formation of the Commonwealth of Independent States (CIS) as a looser association to take its place. They also invited other republics to join the CIS. Gorbachev called it an unconstitutional coup. However, by this time there was no longer any reasonable doubt that, as the preamble of the Accords put it, "the USSR, as a subject of international law and a geopolitical reality, is ceasing its existence."
The final dissolution occurred on 25 December 1991 as General Secretary and President of the Soviet Union, Mikhail Gorbachev, resigned and transferred power to Russian Presiden Boris Yeltsin.
On 8 December 1991 "Gorbachev called it an unconstitutional coup.".
On 25 December 1991, in a nationally-televised speech, "Gorbachev resigned as president of the Soviet Union – or, as he put it, "I hereby discontinue my activities at the post of President of the USSR."[137] He declared the office extinct, and all of its powers (such as control of the nuclear arsenal[138]) were ceded to Yeltsin. A week earlier, Gorbachev had met with Yeltsin and accepted the fait accompli of the Soviet Union's dissolution."
You are claiming thse are two different Mikhail Gorbachevs?
That's without even considering the case of parliaments and leadership of the other former Soviet republics also discussed.
The final round of the Soviet Union's collapse began on December 1, 1991. That day, a Ukrainian popular referendum resulted in 91 percent of Ukraine's voters voting to affirm the independence declaration passed in August and formally secede from the Union. The secession of Ukraine, long second only to Russia in economic and political power, ended any realistic chance of Gorbachev keeping the Soviet Union together even on a limited scale. The leaders of the three Slavic republics, Russia, Ukraine, and Belarus (formerly Byelorussia), agreed to discuss possible alternatives to the union.
On December 8, the leaders of Russia, Ukraine, and Belarus secretly met in Belavezhskaya Pushcha, in western Belarus, and signed the Belavezha Accords, which proclaimed the Soviet Union had ceased to exist and announced formation of the Commonwealth of Independent States (CIS) as a looser association to take its place. They also invited other republics to join the CIS. Gorbachev called it an unconstitutional coup. However, by this time there was no longer any reasonable doubt that, as the preamble of the Accords put it, "the USSR, as a subject of international law and a geopolitical reality, is ceasing its existence."
The final dissolution occurred on 25 December 1991 as General Secretary and President of the Soviet Union, Mikhail Gorbachev, resigned and transferred power to Russian Presiden Boris Yeltsin.
https://en.wikipedia.org/wiki/Dissolution_of_the_Soviet_Unio...