This book originates from the proceedings of the 10th anniversary conference of the Centre for the Law of EU External Relations (CLEER) in which renowned experts in the field took stock of recent evolutions in the law and practice of the EU's external relations. 0In particular, the book addresses the question of how the evolving legal and political framework affects the nature of EU external relations law. The contributions discuss the actions (and reactions) of the EU through external action instruments in a number of substantive areas such as migration, trade, neighbouring policies, security and defence. By shedding light on the most significant developments of the past decade this edited volume attests to the ever-evolving nature of the field of EU External Relations Law.