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Which Russian security agency succeeded the KGB's internal security functions?

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KGB Director of the Soviet secret police Lavrenty Beria.

Following the dissolution of the KGB in the early 1990s, its internal security functions were not immediately assumed by a single entity. Instead, they were reconstituted in early 1992 as the Ministry of Security, which was subsequently reorganized as the Federal Counterintelligence Service (FSK).1

In 1995, this service was renamed the Federal Security Service (FSB) by President Boris Yeltsin. The FSB currently serves as the primary Russian agency responsible for internal security and counterintelligence, occupying the former KGB headquarters on Lubyanka Square.12