During the Cold War the Soviet Armed Forces made the distinction between the various naval commands. The main fleets were the Northern and the Pacific Fleet. They were tasked with independent operations on the high seas and for that reason included strategic surface, submarine and air forces, including the country's naval nuclear deterrent. Due to the limited geography of the Baltic and the Black Seas the respective Baltic and Black Sea Fleets were given a more circumspect role in support of adjacent ground formation (the Main Command of the Troops of the Western Direction in Legnica (Poland) and the Main Command of the Troops of the South-Western Direction in Chișinău. These two fleets were armed with shorter-range weapon systems than the main fleets (diesel-electric submarines, Sukhoi Su-24 fighter-bombers and a larger quantity of frigates and corvettes). Due to the closed nature of the Caspian Sea (still connected to the Baltic and Black Seas through the Volga River and the system of rivers and canals and navigable for ships of corvette size) its Caspian Flotilla had an even more limited role than the Fleets and played a defensive role supporting the Main Command of the Troops of the Southern Direction in Baku.