This paper argues that the end of the Cold War in 1989 and the 11 September 2001 terror attacks ushered in a revolutionary change in the nature of armed conflict in which security is no longer just a military concern. The new security scene is characterized by the uncontrollable proliferation of technology, a growing gap between rich and poor countries and the information revolution. The paper calls for a corresponding revolution in the way we define security in the light of new threats which require new responses. It highlights the implications for institutions such as NATO and the EU, and emphasizes that Turkey has replaced Germany as the keystone state for European security.