Communist Moscow will be divided by a Berlin type of wall

Voinovich Vladimir : writer
In 2042 after the "Great August Revolution", the new leader referred to as "Genialissimus" will change the Soviet Union... The ideology will be changed changed somewhat, into a hodgepodge of Marxism-Leninism and Russian Orthodoxy (Genialissimo himself is also Patriarch). The country will be ruled by "CPGB", the Communist Party of State Security, a merger of Communist Party and KGB. The decay from which the Soviet Union suffered will be worsened. The rest of the Soviet Union, where people barely survive, will be separated by a Berlin type of wall from the "paradise" of Moscow, where communism has been realised. Within the wall everyone gets everything "according to his needs". Only their needs are not decided by themselves, but by the wise Genialissimus.
Most people have "ordinary needs", but a chosen few have "extraordinary needs". For the first-mentioned group, life is dismal even within the privileged "Moscow Republic". The situation finally gets so desperate that people throw themselves in the arms of the "liberator", a fellow dissident writer and (kind of) friend of Kartsev, the Slavophile Sim Karnavalov (apparently inspired by Aleksandr Solzhenitsyn), who enters Moscow on a white horse and proclaims himself Tsar Serafim the First. Thus, communism is abandoned and society progressed back into feudal autocracy. This novel is considered to be a masterpiece of dystopian satire.

Novel "Moscow 2042"