Sergei Mamaev
- Criminal Code
- Article 282.2 (part unknown), Russian Criminal Code
- Case category
- Extremism casesCases against Navalny/ACF supporters
- Verdict
- Imprisonment (general regime)
- Sentence
- 2 years 8 months
- Date of verdict
- 2026-02-16
- Region
- Mari El
- City
- Yoshkar-Ola
Case summary
An activist from Yoshkar‑Ola, a city east of Moscow in central Russia. On 22 July 2025, he reported that he had been detained in a case concerning an "extremist organisation" linked to the activities of Alexei Navalny’s regional offices. The following day, he was remanded in custody. The prosecution appears to have been based on social media posts and participation in events dedicated to Navalny. On 16 February 2026, Mamaev was sentenced to two years and eight months in a general-regime penal colony.
Others charged under Article 282.2 (part unknown), Russian Criminal Code
What we write about political persecution
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Source: this person’s record in the OVD-Info political persecution database
Published under CC BY 3.0. The criteria for treating a person as politically persecuted belong to OVD-Info; FACTUM relays their assessment and makes none of its own.
OVD-Info has been designated an «extremist» organisation in Russia — by decision of the Russian authorities, like other independent human rights and media projects.