Caspian Sea and a Pleistocene stage, that includes glaciation cycles and the creation of the present Volga River. During the first stage, the Tethys Sea had evolved into the Sarmatian Lake, that was created from the modern Black Sea and south Caspian, when the collision of the Arabian peninsula with Western Asia pushed up the Kopet Dag and Caucasus Mountains, setting definitive south and west boundaries to the Caspian basin. This orogeneic movement was continuous throughout the years, while Caspian was regularly disconnecting from the Black Sea. In the late Pontian, a mountain arch rose across the south basin and divided it
Black Sea Fleet the Western sphere of influence. Together with the advent of long-range nuclear weapons, this dramatically decreased the strategic value of any naval activity in the Black Sea. In the later post-war period, along with the Northern Fleet, the Black Sea Fleet provided ships for the 5th Operational Squadron in the Mediterranean, which confronted the United States Navy during the Arab-Israeli wars, notably during the Yom Kippur War in 1973. In 1988 Coastal Troops and Naval Aviation units of the Black Sea Fleet included: In 1989, the 126th Motor Rifle Division at Simferopol was transferred to the Black Sea Fleet from