On 6 March 2018 the Court of Justice of the European Union (“CJEU”) issued its judgment in Case C-284/16 Slovak Republic v Achmea BV.  The CJEU ruled that investor-State arbitration clauses in investment treaties concluded between EU Member States (“intra-EU investment treaties”) are incompatible with EU law.  Before this landmark judgment of the CJEU, international arbitral tribunals and courts considered such clauses to be compatible with EU law. The underlying case In 2012, Achmea BV,…