Informative possibilities of materials on the history of the peoples of South-Eastern Europe on the site "Cossacks of the XV-XXI centuries".

An article, written on the basis of an electronic source base for researching the history of the South Ukrainian Cossack army in the last quarter of the 18th century (website "Cossacks of the ХV–ХХІ centuries"), examines the history of the close relationship of the Ukrainian Cossacks with the events of political and economic life and the national liberation competitions of the peoples of Moldova, Romania (Wallachia and Northern Dobruja), Bulgaria, Greece, Albania, Serbia, Turkey, Poland, Austria. At the same time, little)studied topics of the fate of the Zaporozhian Cossacks and Cossacks from South-Eastern Europe as part of irregular formations after 1775. The question is raised about the introduction of materials into scientific circulation from archival collections of Austria, Romania, Bulgaria, Greece, Serbia, Croatia, Turkey in order to create comprehensive generalizing studies on the issues under consideration [ABSTRACT FROM AUTHOR]