Our paper is dealing with the issues of economic security and international relations in the European Union (EU) at the uncertain times of rethinking European security and sustainability in the face of Brexit and other challenges facing Europe.

The paper focuses on the EU issues from the point of view of the outside observer. It also discusses the EU neighborhood policies, EU energy balance and power nexus, as well as other economic and political challenges that might undermine the position of the EU in the rapidly changing world.

We analyze the EU economic and energy strategy and discuss the implications of Brexit on the EU economy and security in the world affairs. The paper tackles such important issues as energy security, economic security, international trade in the EU and the future of the Eurozone. Our results and implications might be useful for relevant policy-makers, EU decision-makers, relevant stakeholders as well as for the citizens of the EU residing both in the “new” and the “old” Member States who might want to get a non-involved expert insight into the European affairs and that possible pathways of its future development.