First Deputy Chairman of the Committee of the Federation Council on Defense and Security, representative from the legislative (representative) body of state power of the Republic of Mari El. Position before election (appointment): Chief of Staff of the Federation Council of the Federal Assembly of the Russian Federation; Deputy of the State Assembly of the Republic of Mari El of the seventh convocation.
Public support for Russian military aggression against Ukraine. Sergey Martynov is included in the report "1500 warmongers" compiled by the Free Russia Forum. The report contains the names of Russian public figures, military commanders, members of the parliament, propagandists, artists and athletes who have publicly spoken out in support of Putin's aggression or are directly involved in it. The Free Russia Forum is seeking sanctions against them in the European Union.