This volume captures the nature, quality and practice of EU-NATO cooperation by reviewing and critiquing the existing literature, offering new theoretical approaches to the study of this key relationship. The chapters originally published as a special issue in European Security.

Simon J. Smith is currently an Associate Professor in Security and International Relations (IR) at Staffordshire University, Stoke-on-Trent, UK, as well as a Senior Research Fellow at the Scotland Institute, UK, an Honorary Research Fellow at Aston University, Birmingham, UK, and Co-Editor-in-Chief of Defence Studies.

Carmen Gebhard is a Senior Lecturer in Politics and International Relations at the University of Edinburgh, UK. She is Co-Editor-in-Chief of Defence Studies. Her research interests are inter-organisational cooperation in security and defence, the EU's external relations, and foreign policy of small states.

Nina Græger is a Senior Research Fellow at Norwegian Institute of International Affairs, Norway, and Associate Professor II at the Norwegian University of Life Sciences, As, Norway. Her research interests are security practices; inter-organisational relations; IR; European, transatlantic, and Norwegian security and defence; and military sociology.

Introduction - EU-NATO relations: running on the fumes of informed deconfliction Simon J. Smith and Carmen Gebhard 1. Theorising inter-organisational relations: the "EU-NATO relationship" as a catalytic case study Joachim A. Koops 2. Grasping the everyday and extraordinary in EU-NATO relations: the added value of practice approaches Nina Græger 3. The Father, the Son and the Holy Ghost: a Grounded Theory approach to the comparative study of decision-making in the NAC and PSC Simon J. Smith, Nikola Tomic and Carmen Gebhard 4. The EU and NATO's dilemmas with Russia and the prospects for deconfliction Simon Duke and Carmen Gebhard 5. The EU, NATO and the European defence market: do institutional responses to defence globalisation matter? Daniel Fiott 6. The Single European Sky: a window of opportunity for EU-NATO relations Chantal Lavallée 7. The EU and NATO in Georgia: complementary and overlapping security strategies in a precarious environment Sebastian Mayer 8. EU-NATO cooperation: the key to Europe's security future Jolyon Howorth