This article discusses topical issues of the conditions for the emergence of social security pension rights of citizens in regional interstate treaties of the CIS countries on the basis of comparative legal analysis in their retrospective. The purpose of the study involves revealing the features and content of the applied territorial and proportional principles in the implementation of social security rights by citizens of the Commonwealth countries. Problematic issues are the preservation of pension rights and the export (transfer) of pensions, the calculation of pensions that arise when a person carries out labor activities in one state, when a citizen changes his place of residence or moves from one state to another. It is noted that it is necessary to resolve legal conflicts that have arisen by determining the applicable principles for the implementation of pension rights that apply not only to citizens, but to other categories of the population. The author comes to the conclusion that a rational way out of the current situation in the context of the integration of several states is a fair distribution of responsibility according to the principle of proportional responsibility. It is proposed to coordinate the efforts of the CIS states to bring closer together migration, labor, pension and other areas of legislation, which seems to be an important problem for states due to the intensity of migration flows.