"Rethinking European Security" about a critical evaluation of existing security concepts in international politics. And it asks important questions: Is the model of the liberal and rule based order still valid in times of great power ambitions? Is this concept still powerful enough to engage state actors and their behavior? How should the European Union position itself, confronted with a crisis of cooperative security on the one hand and on the other with the reemergence of great powers politics? Achim Spanger offers a contemporary analysis which might initiate a further discussion on this important subject.