Introduction.The full-scale Russian-Ukrainian war became a consequence of the policy of disintegration of Ukraine, which was consistently implemented by the Russian Federation from the very beginning of Ukraine’s independence. After the full-scale military invasion of the Russian Federation into Ukraine, which was accompanied by the occupation of the territory, the genocide of the Ukrainian population, the destruction of civilian and critical life support infrastructure, the violation of international humanitarian law, the disintegration of the Russian Federation became a key political topic, one of the discussed ways to end the conventional Russian-Ukrainian war. Before the full-scale invasion in 2022, at the official level Ukraine, as a democratic, European state, did not carry out disintegration activity towards the Russian Federation. The settlement of the armed ethnopolitical conflict with Russia as for the temporarily occupied territories of Ukraine was carried out exclusively peacefully. The aim of the study is to study the political and legal dimension of Ukraine’s participation in the disintegration of the Russian Federation. The methodology is based on systeman alysis, content analysis and political analysis. Conclusions. The policy of disintegration became an asymmetric response toRussia’s armed disintegration of Ukraine, precisely the holding of fake referendums on joining the Russian Federation of the occupied regions of Ukraine. Ukraine’s responsecontains fundamentally different tools, including non-standard solutions taking into a ccount Russia’s internal destructive processes and the ethno territorial claims of neighboring states to the RF. Despite the lack of a clear strategy for the disintegration of Russia, the formation of a consolidated disintegration position of Ukraine is being observed with the involvement of the international community in strengthening the processes of disintegration of the aggressor state by supporting democratic freedoms, including the right of nations to self-determination, which the authoritarian regimekeeps within the federation with force. Key words: disintegration, Russian-Ukrainian war, nations, right of self determination.