Bringing together leading European and North American experts, this timely volume answers questions about the implications and management of the new external borders of the European Union following another phase of enlargement. Implications of the EU's new external border, especially its eastern border with Russia and Ukraine, will be a key issue for the new member countries, for the EU, and for the new neighbouring regions. The contributors address this emerging question from two perspectives. They examine whether an expanded Europe will create a new dividing line in Europe between 'insiders' and 'outsiders', and also consider the concrete problems of border management and how the issues will be handled. The book will be of particular value to those concerned with European politics and the expansion of Europe, and to those with an interest in political sociology.