The Application of International Law in the Court of Justice of the European Union: Proportionality Rising

Abstract

Application of international treaty and customary international law at the Court of Justice of the European Union (CJEU) is increasingly recognized by scholars as problematic regarding legal certainty. This Article seeks to illustrate why this is and to propose reform. Through comparing judicial approaches in the application of international law at the CJEU to its approach in internal case law, it is argued that in the frequent absence of proportionality in external case law the Court has utilized, redeployed, or varied other judicial devices in an effort to retain the discretion which proportionality affords. These are argued to effect legal certainty and established concepts of justice within the EU legal system. Accordingly, it is submitted that proportionality should be transplanted fully and openly to external relations case law and that support for this can be extrapolated from existing literature.