The paper discusses the role of military conflicts in the (re)construction of “traditional religions” with a focus on Russia. The collective efforts of Russia’s major religious organizations to justify “special military operation” in Ukraine in religious terms have led to a situation where the “new-old tradition” of Russia's “traditional religions” is being reconfigured. In this context, Christian, Muslim, Buddhist, and other religious actors, together with secular officials, are working out universalist arguments as to why this war is morally and religiously legitimate. Characteristics of this situation include (1) the open dialogue between representatives of different religions on the issue of legitimizing violence (what I call an “interfaith” cosmic war in the sense of M. Juergensmeyer); (2) the attempt to create a shared history of Russia’s “traditional religions” and to point to shared ideas and experiences; (3) the inclusion of some formerly undesirable traditions (e.g., the Pentecostals) into the family of “traditional religions”; (4) the blurred line between religious and secular discourses due to the active involvement of secular officials; (5) last but not least, the creation and reconfiguration of specific forms of religiosity in the war zone, where Christian, Muslim, and Buddhist, practices interact.