ABSTRACT
This chapter uses the concept of international regimes, as defined by Krasner, to analyse the transformations occurring in the European security regime grounded in the principles established with the Helsinki Final Act. The permanence of the North Atlantic Treaty Organization (NATO) after the end of the Cold War has contributed to tensions between the Euro-Atlantic and the pan-European security arrangements within the regime. The EU's vision of regional security is hard to grasp, partly due to the Union's unique political features. The debates continue about the reasons for and goals of Russia's annexation of Crimea in March 2014 as well as its engagement in the ongoing war in the Donbass region of Ukraine. The clashing projects for the neighbourhood by the EU and Russia, the competitive readings of NATO and the CSTO, and of the very nature of the European security order, led us to the fundamental question about the erosion of the principles underlying the regime.
