Majority?
https://www.iri.org/news/national-endowment-for-democracy-ne...
Russia's colonial relationship with the Ukrainian people has been disastrous and it is great to see them fighting against an imperialistic and genocidal regime.
Edit, can’t reply:
Russia’s position is that Crimea and Donbas republics had the right to secede due to the fact that Yanukovych was removed via illegal coup (organized by the US). Ukrainian sovereignty was forfeit when Yanukovych was removed despite insufficient parliamentary votes to do so according to the Ukrainian constitution. The Minsk agreements, meant to resolve these disputes, were not implemented, and now based on statements by European leaders we know they were never intended to be implemented.
How does one follow from the other?
You're starting from the fact that Russia is more powerful than Ukraine and working backwards to find justifications for genocide.
Has Russia made changes to its constitution illegally? That would be news to me. There is of course a strong argument that the dissolution of the Soviet Union in 1991 was not constitutional based on the results of the referendum.
What sovereignty does Russia have over Ukraine?