Based on extensive empirical work by a cross-European group of researchers, this book assesses the impact of the creation of the European External Action Service (EEAS) on the national foreign policy-making processes and institutions of the EU member states. As such, the contributions cover both the involvement of the national diplomatic and foreign policy actors in shaping the outlook of the EEAS and its mission, as well as the changes (or not) it has produced for those actors of the member states. The analysis draws in theoretical frameworks from Europeanization and socialization, but also...