Abstract: The subject of this research is the examination of evolution of the idea of self-determination of peoples based on the fundamental works of the Russian and foreign scholars, thinkers of the antiquity and modernity. The author considers the transformations experienced by the principle of self-determination at various historical stages of development; as well as builds a corresponding systems of the development cycles. The conclusion is made that after conception of the idea of self-determination, the colonial powers viewed this concept as ethical, seeing the threat to legitimacy of the established order. Therefore, throughout almost a century, the leading countries refused to include this right into the corresponding international and domestic documents. The main conclusions are as follows: after consolidation of the principle in the Charter of the United Nations, it became the foundation for the emergence of news states and destruction of the colonial world; the principle served as a leitmotif for the development of human rights and international relations, but at the same time became a threat and challenge to the territorial integrity; wars between the countries are replaced with the civil and interethnic conflicts; the world is captured with such phenomena as state nationalism that subsequently grew into extremely radical forms, such as fascism and Nazism; the modern international law actively promotes the two competing principles – territorial integrity and self-determination; in modern world, the right to self-determination is not limited by peoples under the colonial past – there occur new forms of self-determination that threaten the existence of sovereign states. Uncertainty of the status of the newly emerged states formations serves as the source of domestic and international tension, which inevitably leads to intergovernmental clashes and negatively impacts geopolitical situation in separate regions and in the world as a whole.