The relevance of the study is conditioned by the aggravation of the socio-political situation in the world, as a result of which there is a need for a comprehensive historical analysis of the borders of Ukraine, defining its sovereignty, boundaries, and territorial integrity. The purpose of the study was to investigate the establishment of Ukraine in its modern borders. The leading approach to this problem is the historical and genetic method, which helped to comprehensively consider the topic under study by identifying and analysing the most significant events in the history of Ukraine, which had a predominant influence on the establishment of the territory of the modern Ukrainian state. General research methods were also used – analysis and synthesis, and special ones: systematisation, periodisation and chronological method. A consistent study of the emergence of Ukrainian statehood and the unification of Ukrainian lands has been conducted; the main historical periods of the establishment of the territorial borders of Ukraine have been identified and considered; the borders of the Ukrainian state at different historical stages have been described; the territorial distribution of Ukrainian lands in the Soviet period has been assessed; the prerequisites for Ukraine's declaration of independence have been established. The practical significance of the study of the unification of Ukrainian territories together and the establishment of modern borders of Ukraine lies in the possibility of using the materials of the study in teaching the history of Ukraine in secondary and high schools, including extracurricular activities, and in general courses on the history of Ukraine in universities. The main provisions and conclusions can serve as a basis for further scientific work in the field of studying the history of Ukraine in general and its territories and historical borders, in particular
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