This major new textbook for students in European law uses a text, cases and materials approach to explore the law, politics, policy and practice of EU external relations, and navigates the complex questions at the interface of these areas. The subject is explored by explaining major constitutional principles, and elaborating upon them in policy-specific chapters ranging from common commercial policy and development policy over CFSP/CSDP and AFSJ to energy and enlargement policy. Specific attention is given to the relationship between European integration, the role of law, and the EU as an effective international actor. Designed for easy navigation, chapters include key objectives, summaries and textboxes, which frame key issues and guide the reader through the functioning of legal principles. Students gain a detailed understanding of the historical development, context and present functioning of EU external relations law in a highly politicised European and international environment.