The article develops a mechanism for diagnosing crisis situations in the systems of socio-economic development of regions, the practical application of which allows to analyze the current state of regions to avoid negative consequences of crisis situations, prevent the crisis in time, forming a set of preventive measures to improve indicators of the country's efficiency. It is proved that the general socio-economic development of the country depends on regional development, so special attention is paid to this issue. However, regional development may have different strategies and directions, depending on the source data. It should be noted that in the formation of methods for assessing the effectiveness of socio-economic development of the region and the subsequent choice of effective methods of influencing the socio-economic development of the region it is necessary to objectively determine the priority direction of development of both country and region. Defining priorities in the socio-economic development of the region will allow to qualitatively determine preventive management measures. Many factors are considered in the formation of strategies and goal setting, such as the availability and specificity of natural resources, demographic situation, geographical location, production structure and specialization. The integral indicator of social and economic development of the country which gave the chance to reveal crisis situations in the country caused by a few external and internal factors is constructed in work. The current crisis situations were also confirmed by the indicators of the gross domestic product of the country. The share of each of the regions in the formation of GDP during periods of crisis in the country has been established. Among each of the considered years, which are defined as crisis years, the largest share in the formation of GDP is occupied by Dnipropetrovsk, Kharkiv and Kyiv regions.
The mechanism of crisis diagnostics considered in the work allows to trace changes of influence of separate regions on formation of GDP. The mechanism also makes it possible to identify those regions that, in different circumstances, are in crisis and offer them a set of measures aimed at accelerating economic growth, including attracting foreign investment and creating new jobs. The result of such measures should be individual socio-economic development programs aimed at achieving regional and state goals, developed jointly with interested state and local authorities.