I have to constantly prove that what you write, to put it mildly, is not true.
The right of free secession of each republic from the USSR was enshrined in Article 72 of the 1977 USSR Constitution, which was in force during the period of Ukraine’s secession from the USSR in 1991. This article had only one sentence, namely: “Each union republic retains the right to freely secede from the USSR.”
If what you write is true then please tell why didn't Ukraine want to suceed from the USSR?Why didn't they do it in the times of the USSR?
What I wrote about the right of each of the USSR republics to voluntarily secede from the USSR is freely available and you can easily check it.
Russia has always been a prison of nations, no matter what signs about voluntary unions it hides behind.
So, on November 20, 1917, the Central Rada of Ukraine adopted the Third Universal, which proclaimed the creation of the Ukrainian People's Republic. It ceased to exist in 1920 as a result of the invasion of the Red Army, which eliminated its independence.
The Ukrainian Soviet Socialist Republic was formed in 1919 as a result of the armed aggression of Bolshevik Russia and was subject to Russian influence until the complete Sovietization of Ukraine.
Therefore, in practice, secession from the USSR was impossible under the strong central government of the Kremlin. It was only in 1991, when this central power in Moscow was weakened by internal events, that Ukraine, like other former Soviet republics, took advantage of this opportunity.
The Russian Federation will also become very weak as a result of the current war with Ukraine, and other nations and nationalities that are still held by force within the Russian Federation will certainly take advantage of this.