'Van Vooren and Wessel [have written] an exceptional book. The selection of material as well as its presentation is of very high quality, making it an ideal point of reference and, at the same time, a very handy teaching tool. Without a doubt, this volume will become a classic, a real must-have for academics and practitioners dealing with external relations of the European Union.' Adam Lazowski, University of Westminster 'Another excellent EU Law essential from Cambridge University Press. At a time when the EU as an external actor is increasingly under scrutiny, here is a scholarly and innovative treatment of EU external relations law. Van Vooren and Wessel's contextual - and very readable - approach, accompanied by in depth legal analysis, renders this text indispensable for EU law teachers and advanced level EU law students.' Carole Lyons, Robert Gordon University 'This latest textbook contributing to the field of EU external relations law is unique in that it is the first such book in the post-Treaty of Lisbon environment to take a wide-angled look on as many aspects of the growing area as it continues to develop within the legal parameters as set by the Treaties, and it is suitably placed to become the core text for teaching this expanding EU policy field ... Not only is this textbook a very welcome and long overdue addition to the field of scholarly work, it also has the potential to become, de-facto, the core textbook in this area for time to come.' Graham Butler, Romanian Journal of European Affairs