The war between Russia and Ukraine raises numerous questions about the causes that provoked it, respect for human rights before and during war operations, on the implications that the armed conflict will have in the Eurasian geopolitical order. Among the profiles that deserve in-depth study is that pertaining to the regulation of the phenomenon of religious, taken as a pivot of the cultural identity of the countries involved. The purpose of this contribution is to evaluate through the lens of law the measures limiting of religious freedom and its exercise, which have been carried out in Crimea, a nerve center of the conquest. In the analysis a central role is played by the judgment of the Grand Chamber of the Court of Strasbourg on 25^th June 2024, which found a violation of Article 9 of the EDU Convention by the Russian Federation against Ukraine, its citizens and denominational institutions in the period following the annexation of the Crimean Peninsula.