_Purpose._ The authors of this paper seek to comprehend, on the basis of ethics of discourse and communicative philosophy, the dimensions of human existence in times of war. This involves solving the following research tasks: to show the importance of moral and ethical norms in the structure of human existence and to emphasize the need for their observance by a person in the realities of war; to find out what the role of responsibility and co-responsibility is in preserving the space (...) of human existence in times of war; to explore the influence of discourse on the establishment of rational and social dimensions of human existence, formation of communicative space of understanding. _Theoretical basis._ The ideas of communicative philosophy and principles of discourse ethics, focused on the problems of substantiating ethical norms and values in their relationship with the human life world, and its activities are underlying the research. The analysis of human existence in times of war was carried out considering the theoretical and methodological foundations of philosophical anthropology. _Originality._ It is substantiated that the recognition of the universality of moral norms and values, and the productive power of communication contribute to deepening the understanding of the complexity and versatility of human existence in times of war. It has been determined that human existence’s rational and moral dimensions acquire particular significance in the context of russian aggression against Ukraine. The role of discourse was defined for affirming the humanistic foundations of human existence, in achieving cohesion, interaction, social solidarity, which is a condition for human development as a collective and unique being. It is noted that in war conditions the value of individual forms of human existence is complemented by the obligatory responsibility and co-responsibility for a person, awareness of the significance of coexistence in a situation where there is a threat to human life. _Conclusions._ The study of human existence involves the use of the methodological potential of discourse ethics, the significance of the ideas of which is increasing in the modern world because of the dangers caused by russian aggression against Ukraine. The recognition of the power of universal moral norms and the productive power of communication results in the affirmation of the humanistic foundations of human existence, the formation of the communicative space of understanding and consent necessary for a person. In times of war, the need for communicative rationalization of human existence, awareness of the value of morality and human humanity becomes obvious. (shrink)