In The Ideas and Practices of the European Union’s Structural Antidiplomacy, Steffen Bay Rasmussen offers a comprehensive analysis of EU diplomacy that goes beyond the functioning of the European External Action Service and discusses the sui generis nature of the EU as a diplomatic actor, the forms of bilateral and multilateral representation as well as the actor identity, founding ideas and meta-practices of EU diplomacy. The book employs a novel theoretical approach that distinguishes the social structures of diplomacy from the practices and meta-practices of diplomacy. Comparing EU diplomacy to the two theoretically constructed ideal types of Westphalian diplomacy and utopian antidiplomacy, Steffen Bay Rasmussen concludes that the EU’s international agency constitutes a new form of diplomacy called structural antidiplomacy.