This paper presents a diachronic study of Russian prefixes in the political news reporting. Theanalysis examines derivational prefixes in the Russian media discourse for each year in the timeperiod 2012–2020. The prefixes are analyzed using derivational keymorphs. The data materialconsists of a corpus of political texts from more than 60 Russian online media resources. Keymorphs have previously been used to investigate Czech presidential discourse (Fidler and Cvrček,2019), the Russian media resource Sputnik Czech Republic (Fidler and Cvrček, 2018; Cvrček andFidler, 2019) and Putin’s speeches (Janda et al., 2023). The use of keymorphs enables one to focuson morphological features and to capture general characteristics of the textual content in a language corpus. The work uses Corpus-assisted discourse studies (CADS) as the main frameworkand is a contribution to the understanding of Russian political discourse.