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Modern challenges for international law application in the former USSR countries are inextricably linked to the regional integration issues. Despite seeking closer rapprochement with the EU, Russia never dropped its ambitions as a spearhead of political, economic and legal integration within the post-Soviet area. Belarus actively participates in the post-Soviet integration projects while seeking improvements of EU-Belarus relations. However, Ukraine embarked upon a long and challenging path of deeper political and economic integration with the EU and aligning its legal system with the EU acquis. Against this backdrop, this article studies the constitutional dimension of three post-Soviet republic’s engagement in regional integration projects identifying the problematic issues in the application of international law.

EU-Belarus relations have seen many changes throughout the years ranging from closer engagement to isolation. Although recently the relations started to improve, the main international agreement between Belarus and the EU is still the one concluded by the Soviet Union. Even though there are plans on changing the situation and concluding a new international framework agreement with the EU, it is clear that Eurasian integration is of primary importance for Belarus. This article focuses on analyzing the legal basis of the EU-Belarus relations, effect that international contractual obligations have in the domestic legal order, and the way membership to the Eurasian Economic Union influences that. It is argued that new contractual legal framework between Belarus and the EU is imaginable, although it would be limited, among others, due to transfer of certain exclusive competences to the supranational level of the Eurasian Economic Union.