RBSF meaning in Military and Defence ?

The Black Sea Fleet (Russian: Черноморский Флот, Chernomorsky Flot) is the fleet of the Russian Navy in the Black Sea, the Sea of Azov and the Mediterranean Sea.

The fleet traces its history to its founding by Prince Potemkin on May 13, 1783. The Russian SFSR inherited the fleet in 1918; with the founding of the Soviet Union in 1922 it became part of the Soviet Navy. Following the collapse of the Soviet Union in 1991 the Russian Federation inherited the Black Sea Fleet and most of its vessels.

The Black Sea Fleet has its official primary headquarters and facilities in the city of Sevastopol (Sevastopol Naval Base). The remainder of the fleet's facilities are based in various locations on the Black Sea and the Sea of Azov, including Krasnodar Krai, Rostov Oblast and Crimea. The current commander, Admiral Igor Vladimirovich Osipov, has held his position since May 2019.