This article outlines the present structure of the European Union's Common Security and Defence Policy (CSDP), a part of the Common Foreign and Security Policy (CFSP) based on articles 42–46 of the Treaty on European Union (TEU). Article 42.2 of TEU states that the CSDP includes the 'progressive framing' of a common Union defence policy, and will lead to a common defence, when the European Council of national heads of state or government, acting unanimously, so decides.