The article summarizes the history of the Russian–Ukrainian encounters in memory politics from the 1990s to the start of the 2020s. It compares and contrasts Russia’a and Ukraine’s perceptions of the issues, goals, tasks, and methods of historical policy. Having a shared history and similar challenges in developing identities and tackling the politics of commemoration, the cultural elites and governments of both countries approached the task of identity-building from opposite perspectives. These differences stemmed from different interpretations of one’s nation’s place and role in world history. The article summarizes all critical points of disagreement regarding how the two countries understood their shared past and interpreted it. It observes the history of the joint initiatives between Russia and Ukraine to reconcile confronting narratives. The analysis shows how the shared past perceived and conceived in divergent ways amounted to the mnemonic anxiety and securitization of the collective memory clash of antagonistic versions of the past and triggered the conflict and war.