Since the ratification of the Treaty of Lisbon in 2009, the European Union (EU) has tried to make its voice heard more clearly on the international stage by creating the European External Action Service and strengthening the role of the High Representative for Foreign Affairs. However, these and other tools do not seem to increase the EU's weight in conflict resolution in its wider neighborhood. In the Nagorno-Karabakh conflict, the EU's efforts are hampered by competing interests of third actors, by the inadequacy of the tools at its disposal and not least the ambitions of its own member states.