The difficult and tragic lessons learned of the first year of the full-scale invasion of the Russo-Ukrainian war (24.02.2022– 24.02.2023) showed that cultural heritage, its preservation and restoration is an important component of Ukraine’s national security. Along with the attack on Ukrainian lands, there is an attack on the identity of Ukraine with the aim of depriving it of its cultural heritage. Deliberate destruction of cultural heritage is a war crime and must be prosecuted by an international court under the 1954 Hague Convention, and damage to Ukrainian cultural institutions could become an evidence in a potential war crimes case. The paper analyses the strategic and tactical tasks that the guardians of cultural heritage face, as well as the analysis of the activities and documents of international organizations, and the reaction of the international media to the issue of cultural heritage in the context of the war confirms that the support of the world public of Ukraine, while drawing attention to the acute problems of preserving cultural heritage in rear country. The paper studies the publications in the Western mass media, which were exchanged by members of Europa Nostra in a social-media community created specifically for this purpose—discussing the status of cultural heritage of Ukraine in the war. Through the prism of a professional cultural heritage international organization, this case study allows drawing conclusions for the design of methodical and methodological basis for further study of cultural heritage in the war not only in Ukraine but in general. Based on the analysis, the recommendations for national and international organizations could be provided.