Iraq can be considered the 'perfect storm' which brought out the stark differences between the US and Europe. The disagreement over the role of the United Nations continues and the bitterness in the United States against its betrayal by allies like France is not diminishing. Meanwhile, the standing of the United States among the European public has plummeted. Within Europe, political tensions between what US Secretary of Defense Donald Rumsfeld euphemistically called the 'Old' Europe and the 'New' Europe continue to divide. To fully comprehend these rifts, this volume takes a specific look at the core security priorities of each European state and whether these interests are best served through closer security collaboration with the US or with emerging European structures such as the European Rapid Reaction Force. It analyzes the contribution each state would make to transatlantic security, the role they envisage for existing security structures such as NATO, and the role the US would play in transatlantic security.