In November 2010, the conclusion of the two treaties between France and the United Kingdom sparked numerous suspicious reactions in Europe. This article is led by a double question. More than one year after they have been concluded, what are the achievements of the treaties in terms of cooperation? Do the accomplishments allow to have a better view of their impact on the European Security and Defence Policy? Without jumping to conclusions, it is already obvious that the progress is tenuous because of several technical and political obstacles. While the operation in Libya highlighted the European shortage in military means, a strict bilateral cooperation among the two European states is more than ever questionable. In an era where the world is in permanent mutation, a deeper European political integration seems to be necessary.
Key words : France, United Kingdom, European Union, (EU), ESDP, franco-british cooperation, Libya.