In 2016 he became head of the "Municipal Guard" of Kremenchuk, and the same year he co-founded the Natural-Ecological Control non-governmental organisation and the All-Ukrainian Union of Anti-Terrorist Operation Veterans, Military Activities, and Peacekeeping Missions.

[4] Berezin again ran to represent the district in the 2019 Ukrainian presidential election, this time as part of Zelenskyy's Servant of the People party.

He is described by anti-corruption non-governmental organisation Chesno as part of a group of Servant of the People deputies closely connected to oligarch Ihor Kolomoyskyi.

He supported Draft Law 5655, which Chesno criticises as placing reconstruction following the Russian invasion of Ukraine in control of property developers rather than citizens in general.

[2] Anti-corruption media portal Antikor has criticised Berezin for his closeness to Kremenchuk mayor Vitalii Maletskyi [uk], who has been involved in several corruption scandals.