The shock of the vote for Brexit - the UK's 23 June 2016 referendum on leaving the European Union - is being felt in all areas of the UK policy community: in domestic and foreign affairs, in politics, economics and the law. But the IISS is an international institution and Brexit is not just a British phenomenon. Spanning 13 years this collection of articles depict a European project struggling to expand geographically, to deepen institutionally, and to survive in the face of political, economic and security threats worldwide.