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One recent but major policy occurrence in Justice and Home Affairs -the Treaty of Prüm (2005) -has developed within the framework of differentiated integration, thus reopening the debate over the impact of flexibility on EU integration, what causes it, and whether it should be sought by Member States at all. Whatever the consensus, the debate itself demonstrates that the very idea of differentiated integration deserves a renewed attention today ultimately because it affects, in one way or another, the performance of the EU. This article presents a critical analysis of the practice of differentiation in Justice and Home Affairs, by examining its forms, principles and effects. It discusses the literature on the subject, emphasizing the complexity of flexible integration, but reaches different conclusions. Thus, in contrast to the dominant argument, we argue that differentiation is not necessarily about deepening and/or widening EU integration. It is also, and sometimes primarily, about power and interests, two major elements that feed mistrust among Member States. In fact, we demonstrate that mistrust can cause poor differentiation. Moreover, in the absence of trust among Member States, flexibility might contribute to suboptimal policies. Based on past research and interviews, we substantiate our claim by investigating the driving factors, rationales and consequences of the Treaty of Prüm on the institutionalization of a EU area of Freedom, Security and Justice.

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This text examines the dynamics that shape foreign policy using international relations (IR) theory. Combining theories and case studies with actors, it explores the grand principles at work in foreign policy, both as a form of state behaviour and as an intellectual field. Chapters illustrate the complementarity between individual, state, and structural dynamics of IR, and levels of analysis found in foreign policy analysis. They discuss the relevance to foreign policy of the main IR theories: realism, liberalism, and constructivism, alongside the tool of discourse analysis. This introduction provides an overview of the contemporary relevance of the study of foreign policy; some of the definitional issues concerning the study of foreign policy; and the book’s updated organization.

2015 has shaken the EU to its core. Hard upon the heels of geopolitical upheavals in Ukraine, as well as internal battles to define both Eurozone and energy governance, the refugee crisis has prompted a sober reckoning of the EU’s competence and its humanity. With an increasing number of articles and Special Issues in <em>Politics and Governance</em> focusing upon key aspects of the EU as both a political actor, and a source of governance, our autumn 2015 editorial looks briefly at the significance of the refugee crisis in the context of the EU’s current response and future options.