The purpose of the work is to highlight examples of modern proactive documentation by state archives of the events of the Russian-Ukrainian war and the diff erences between proactive documentation as archival documents. An analysis of the history of proactive documentation was made using the examples of recording evidence of Nazi crimes on the territory of Ukraine during the Second World War, documenting the facts of the Orange Revolution, the 2004 presidential elections etc. The methodology of the article is based on the application of general scientifi c methods, namely: systemic, conceptual, functional, retrospective and comparativehistorical analysis. The study of the infl uence of the Russian-Ukrainian war on the technology of work of the state archives of Ukraine led to the use of comparativehistorical and retrospective methods. The application of the functional method also played a signifi cant role in the scientifi c research, in particular during the analysis of the social functions of archival documents. Scientifi c novelty. The practice of initiative documentation and its modern spread in state archives could not help but infl uence the methodological aspects of Ukrainian document studies and archival studies. The authors of the article assume that the archival document created as a result of initiative documentation is not appropriate in its defi nition in terms of the completeness of the function for which the document was created compared to the established defi nition of the concept of «archival document». And the very practice of a document created as a result of initiative documentation acquiring the status of an archival document with a permanent storage period is somewhat diff erent from the typical practice of forming archival collections, for example, of administrative or personal origin. Conclusions. There is an urgent need to prepare a study of initiative documentation by state archives of the events of the Russian-Ukrainian war, to develop optimal methods of its implementation and technologies for further archival work with the created documents, which should be based on the study of the archives’ experience.