The purpose of the article is to identify changes in the attitudes, values and postulates of Ukrainian consumers during the Russian aggression and to assess the trends of changes in the development of marketing communications of enterprises during the war in Ukraine. Critical analysis of the literature on this topic was used as research methods in the theoretical part. In the empirical part, the descriptive-comparative method and case studies were used to analyze the content of advertisers and the reaction of consumers to them. For her research, carried out in September 2022, the Author applied a survey on the Google Forms platform, in which 198 respondents aged 18–25, from universities in different regions of Ukraine, took part on a voluntary basis. The research sample is deterministic, not representative. In addition, the article uses the results of research on this topic by the research companies Gradus Research, Deloitte Ukraine, Kantar, and the American Chamber of Commerce, all conducted between February and October 2022. The results of the research as presented in the article allow us to conclude that Russian aggression significantly influenced the behavior of consumers and their preferences regarding communication messages. Currently, processes related to the protection of national identity are taking place in the Ukrainian society. Therefore, since the first days of Russian aggression in Ukraine (dating since February 24, 2022), a great demand has been seen for the values of patriotism in advertising campaigns, and consumers prefer brands that advertise them. At the same time, the results of the study indicate that the continuation of the armed conflict may lead to a habituation effect and a certain decrease in the effectiveness of marketing communication of enterprises based on the category of patriotism in their campaigns.