Federal Security Service; the principal security agency of Russia, successor to the KGB.
Acronym from Russian 'Federalnaya Sluzhba Bezopasnosti'. Established in 1995 as the domestic successor to the Soviet KGB, inheriting many of its functions and personnel.
The FSB represents continuity with Soviet-era intelligence services despite Russia's political transformation. Many of its leadership positions have been filled by former KGB officers, illustrating how institutional cultures can persist through major political changes.
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