The article discusses the possibilities and limits of assessing the stability of political systems in partially recognized states. The author explores the features, properties and characteristics of the central phenomena – «political system», «stability», «stability», «partially recognized states». Considerable attention is focused on establishing differences and similarities between the concepts of «stability» and «sustainability». The relevance of the study is determined by the need to establish links between the state of political systems, partially recognized by the state from external and internal political processes and relations.The methodological basis of the study is: general scientific and systemic methods; structural-functional and comparative political methods; content analysis of historical and legal documents. The chosen methodological base is determined by two factors: the first is modern trends, patterns and processes of progressive development of domestic and foreign political science; the second is the author’s position of the researcher.The results of the study indicate the possible validity of assessing the stability of the political systems of partially recognized states, considering the peculiarities of their political culture. While, as external factors that determine individual, but essential elements of the political system of partially recognized states, they indicate the characteristic instability of the political systems of the studied polities.