This chapter examines the recent decision by the European Court of Justice in Kadi and Al Barakaat International Foundation. It is a response to criticism that the ECJ’s judgment, in providing for the review of EC measures implementing UN Security Council resolutions, undermines the authority of public international law. Instead of committing itself to international law and institutions at all cost, the ECJ concerns itself with the constitutional repercussions from national constitutional courts (in the case of failure to protect fundamental rights). Important as the relationship between EC law and international law is, there is a clear sense that the ECJ is responsible to, and will ultimately be held to account by, the courts and constitutions of the Member States of the European Union.