Russian Federation is not created on free will, but on force. Nobody asked peoples is they want to become members of RF. IMHO, if an exit referendum will be allowed in RF (they are forbidden), then most nations will take opportunity and escape. Currently, escape is not possible.

For example, Chechnya tried to escape the prison, so Russian used thousands of tons of explosives, FAE's (which is comparable to low yield nuclear weapons) to destroy independent Chechnya state, which was able to escape after first war. Russian FSB bombed their own citizens to provoke war with Chechnya.