This book provides a comprehensive analysis of the role of the EU in international security through five detailed case studies and in doing so fills a distinct gap in the scholarship on European security and policy-making. Significantly, it offers a broadened conceptualization of the EU as an international security actor, including JHA policy. Furthermore, case studies which explore, amongst other things, EU responses to piracy off the coast of Somalia, climate change and terrorism offers a fresh insight into EU policy on contemporary security challenges. As such, this book constitutes an important and original input in the debate on European security after the ratification of the Lisbon Treaty and is a must-read for students and scholars of EU Politics, Security Studies and International Relations.