Long the main pillar holding up the transatlantic relationship, the security of Europe seems to have turned into an accessory element in the transatlantic security agenda. In recent years, the United States and European countries have often been unable to find enduring convergence over how to deal with issues related to Europe’s security, such as NATO’s role, relations with Russia and other former Soviet republics, and the European Union’s ambition to develop an autonomous military arm. Concerns, however, about trends inexorably leading to the drifting apart of the transatlantic partners seem exaggerated. In fact, under the Obama administration, the United States and its European partners have found some new common ground. An effort to transform occasional convergences into a shared vision of Europe’s long-term security would contribute considerably to re-energizing the Euro-Atlantic bond. Though not on the same scale as in the past, Europe’s security can still be a significant component of the transatlantic relationship.