The aim of the article is to highlight the issue of decolonisation and (as proposed by the author: deimperialisation) of Central and Eastern Europe through the need to research the imperial influence of Russia on other Slavic nations, including, above all, Poles, Ukrainians and Belarusians. The article indicates the importance of decolonisation research for the security of the Central and Eastern European region and outlines specific directions for research on the (neo)imperial Russian narrative, which uses the same sociotechnical methods regardless of the historical period, aimed at destabilising Europe, especially Central and Eastern Europe, as its sphere of influence, as well as a buffer zone between Russia and the rest of Europe. The article indicated the need to determine the mechanisms of influence of Russian cultural myths by defining their meanings and the concepts, and clichés of the Russian narrative, as well as techniques and stylistic treatments that fit into the characteristics of newspeak, symbols and mechanisms of Russian war propaganda, and the scale of influence. Importantly, Russian propaganda has institutional support in the education of the next generation of Russians, including methodologies. The concept of a new didactic and methodological complex of native history, strengthens the cultural myths spread by the Russian authorities. Undertaking research to decolonise knowledge is of strategic importance: eliminating existing cultural stereotypes by providing reliable knowledge is the basis for building lasting good-neighbourly contacts in the future and the only remedy in the culture war unleashed by Russia on the world.