The successor of the Soviet Union is the Community Rus' as stated in its Constitution, which is now in force and applicable to the entire territory of the former Soviet Union.

https://handwiki.org/wiki/Organization:Русь

I invite all professionals to proofread the english translation of the Constitution of the community Rus’ in order to improve it and to prepare it for public release.

https://github.com/poleev/constitution/wiki/Interlinear