The relevance of this study stems from the need to examine diary discourse in modern Ukrainian military literature, highlighted by increased interest in new diary varieties, functions, and genre syncretism. The purpose of the study is to analyze diaries created after the Russian invasion on February 24, 2022, focusing on their nature, features, genre parameters, and how they differ from diaries written during the initial aggression in 2014. During the processing of diary texts, historical–biographical, comparative‐historical, and complex elements of hermeneutical, structural methods, textual, correlation, and discourse analyses were most often used. In addition, the method of comparing subject–object planes, and dimensions, was used for functional genre refinement. The paper presents a systematic analysis of the modern military diary, highlights its structural modifications, defines static and acquired functions, and describes the status and importance of the latest literary process among other genres. The results of the study can be used for the preparation of basic and special lecture courses on the theory and history of Ukrainian and world literature.