The purpose of this book is to study the development and implementation of international conflict resolution and crisis management policies of the EU in the frame of Common Security and Defence Policy (CSDP) and to investigate the effîciency of its activities towards enhancing civilian and military capacities in this area. As part of this research, Transnationalist and Intergovernmentalist approaches in the base of International Relations and European Integration theories, history of the EU and CSDP including Brexit, decision-making processes of the Union, and the business of the European Defence Agency (EDA) are examined.