The European Union and NATO have many points in common, yet neither can fully play the role of the other, and so both are necessary. Progress made in one organisation is to the advantage of the other. In this article NATO’s Secretary General argues that since their agendas increasingly overlap, a strong ESDP and closer relations between them are essential. In his view, the time has come to move on from ‘détente’ to working in common. Why don’t we, for instance, embark on a ‘NATO-EU Combined Capabilities Initiative’, or a ‘Combined NATO-EU Strategic Airlift Project’?