Federal Security Service (Russian: Федера́льная слу́жба безопа́сности Росси́йской Федера́ции (ФСБ), tr.Federálʹnaja Slúžba Bezopásnosti Rossíjskoj Federácii (FSB), the principal security agency of the Russian Federation and main successor to the defunct Committee for State Security (KGB) of the Soviet Union
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