The Russian invasion of Ukraine has disrupted the post-Cold War international order, challenging foundational principles of sovereignty and territorial integrity while introducing new dynamics in global alliances and power structures. The aggression has invoked a strong religious narrative that played a crucial role in legitimizing Russian actions and shaping public opinion domestically and internationally. Russian political and religious leaders, particularly within the Russian Orthodox Church, have framed the invasion as a defense of Orthodox faith and values, promoting the concept of a "Russian World" (Russkiy Mir) as a sacred mission. This narrative, endorsed by Patriarch Kirill of Moscow, portrayed Russia as the custodian of traditional Christian values in contrast to Western liberalism and moral relativism, intertwining religious and political motives in justifying the aggression. The symbiotic relationship between the Russian state and the Russian Orthodox Church amplified this religious rhetoric, turning it into a powerful tool of soft power and legitimizing the conflict on spiritual and cultural grounds. This paper examines the religious dimension of the Russia-Ukraine conflict through the lens of geopolitics and the Russian Orthodox soft power, exploring the religious justifications employed by the Russian Orthodox Church and its alignment with Russian state objectives.