Russian Federal Security Service (RFSS)

The Russian Federal Security Service (Федеральная служба безопасности; ФСБ; English: Federal Security Service, abbreviation: FSB) is one of the "world's four largest intelligence organizations" (the other three are the U.S. Central Intelligence Agency (CIA), the British Military Intelligence (MI6), and the Israeli Mossad), mainly responsible for Russia's domestic security affairs, while foreign intelligence affairs are handled by the Russian Foreign Intelligence Service (FIS). FSB is one of the "four major intelligence organizations in the world" (the other three are the CIA, MI6, and Mossad), and is mainly responsible for Russia's domestic security affairs, while foreign intelligence affairs are handled by Russia's Foreign Intelligence Service (FIS).