Proposed federal subjects of Russia
Numerous proposed federal subjects have been put forward since the dissolution of the Soviet Union that would partition existing federal subjects of the Russian Federation. Many new federal subjects were declared in the 1990s, most of them were not recognized, while others, like Adygea and Altai Republics, which were previously autonomous oblasts, were recognized.
Source: Wikipedia — Proposed federal subjects of Russia (CC BY-SA 4.0)