Russia went through a phase, during the Stalinist years, when they claimed that every major invention had been the result of Russian ingenuity and a clear demonstration of the superiority of the soviet system. Included on the list was radio (did you not know that Marconi was Russian?), the telephone, television and the lightbulb! However, their outlandish claims went beyond science and technology when they also claimed to have possessed Atlantis, which is now covered by the Caspian Sea!
Today, Russia has just a short coastline on the Black Sea another proposed location for Atlantis. Flying Eagle and Whispering Wind, who are proponents of this theory(a), claim a specific site on the Strait of Kerch between the Black Sea and the Sea of Azov. They claim(b) that there is evidence that the Kopet-Dagh fault line, which runs just above the strait, experienced a devastating (8.9) earthquake around 9600 BC destroying Atlantis in the Strait. At this time what we now call the Sea of Azov was the well irrigated plain adjacent to the city of Atlantis described by Plato. They claim that the earthquake caused a massive influx of water from the Caspian Sea, which been rising due to the melting icecaps in the north. This combination caused the creation of the Sea of Azov and the flooding of Atlantis.
The more conventionally named Christian & Siegfried Schoppe have also opted for the Black Sea as the home of Atlantis, but have identified a different mechanism for its destruction, namely the breaching of the Bosporus around 5500 BC.