This chapter examines the European Union's key decisions on enlargement as well as the EU's influence on its European neighbours and on the shape of European order. It begins with an overview of the ‘concentric circles’ approach adopted by the EU — then the European Community — to put off the prospect of enlargement and instead proceed with economic and political integration, while strengthening its relations with its European neighbours. It then considers the Copenhagen European Council of June 1993, the Luxembourg and Helsinki European Councils, and the EU's big-bang enlargement. It also analyses the EU's relations with South-Eastern Europe, Turkey, and the ‘wider Europe’. Finally, it explains why the EU member states agreed to a radical reshaping of the European order through enlargement and assesses the future of the enlargement project.