Are you disputing Russia’s position? It seems in line with the actions of the Ukrainians in the Donbas region since 2014.

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.