The correlation of national, supranational, trans-regional, and internationallegal systems is a concern of comparative legal (including their political science andinternational relations aspects) studies because it has decisive influence on how Statesposition themselves within the family of nations, perceive themselves in the surroundingworld community, and build relations with other nations, international organizations,and the international community as a whole. At the same time, the correlation hasimmense pragmatic significance, for it is the essential basis for determining which of themulti-level management legal systems operates and/or prevails when the rules bindingon individuals, societies, businesses, civil services, international organizations, andinterstate communities are formed within or outside of national jurisdictions. Study ofthis correlation is of particular importance in the context of the growing complexity ofthe international legal field and multilevel management systems, as well as in the lightof current trends in the development of international economic and political processes.On the one hand, the growing international confrontation and misuse of internationallegal instruments are forcing States to take measures to protect their internal law systems.On the other hand, the need to build harmonious international cooperation requiresthem to open their legal systems to some extent. The article discusses the experience ofvarious integration structures in this context. The authors claim that the project of theGreater Eurasia has the advantage of sharing a common Soviet legal heritage, whichalready establishes a common legal language and cohesive terminology – factors thathave, for example, restrained EU integration efforts. Whatever the CIS may or may nothave achieved, meeting expectations or otherwise, it represents nearly three decades of integration experience.