Conditions of expansion of economic integration of regions
<b>Importance</b> The article considers the issues of theoretical substantiation of conditions of regions' economic integration expansion, generally recognized methodological approaches, and integration tools, as well. <br></br> <b>Objectives</b> The article intends to substantiate conditions of expansion of economic integration of regions for organization of interregional interaction. <br></br> <b>Methods</b> For the study, we used the systems approach, logic techniques, and the methods of economic and mathematical modeling. <br></br> <b>Results</b> The article develops and presents a concept of expansion of economic interregional interaction. It also puts forward a hypothesis of uncommitted resources. <br></br> <b>Relevance</b> The results of the study can be used to improve the systems of territorial planning taking into account the challenges and threats to national security and evaluate the implementation of the State strategy for spatial development of territories.