Published in the European Constitutional Law Review (2012), Vol. 8, CEPS Senior Fellow Steven Blockmans co-authored this article with Leendert Erkelens, Associate Researcher at the T.M.C. Asser Instituut, The Hague. In examining the formation of the European External Action Service, the authors consider the Treaty of Lisbon and the role of the High Representative of the Union for Foreign Affairs and Security Policy – in combination with role of Vice President of the European Commission responsible for external action. They also look at the institutional balance between the Commission and the Council, the curtailment in practice of the High Representative's ‘Vice Presidential’ powers and the hybrid approach taken towards the role of the EEAS in both an intergovernmental and communitarian sense.