Marking the 50th anniversary of the influential ERTA doctrine, this book analyses and contextualises the entire breadth of the jurisprudence of EU external relations law through a systematic, case-by-case account of the field. The entire framework of EU external relations law has been built from the ground up by the jurisprudence of the Court of Justice of the European Union. At the beginning of the field’s emergence, the legal questions to be answered concerned the division of powers and competence between, firstly, the Member States and that of the Union; and secondly, the division of...