In Russia, Kazakhstan and Belarus
Russia
Operating since 1 January 2023 (Federal Law No. 236-FZ). You can contact it at a client service office, via an MFC, on Gosuslugi or at sfr.gov.ru; the single contact centre number is 8-800-100-00-01.
Kazakhstan
Similar functions are split: social payments from the State Social Insurance Fund (ГФСС, GFSS) are granted by the State Corporation “Government for Citizens”, and pension savings are held by the Unified Accumulative Pension Fund (ЕНПФ, ENPF).
Belarus
The equivalent is the Social Protection Fund (ФСЗН, FSZN): it collects contributions and grants pensions and social insurance benefits.
Sources: Social Fund of Russia («Социальный фонд России»), Gosuslugi, the government services portal («Госуслуги»)