Republik Griechenland v Grigorios Nikiforidis
Article 9(3) of Regulation No 593/2008 bars the court of the forum from applying, as legal rules, overriding mandatory provisions other than those of the forum State or of the State where the contractual obligations have to be or have been performed. The forum court may nevertheless take such other overriding mandatory provisions into account as matters of fact, provided that the national law applicable to the contract under that regulation so allows. The principle of sincere cooperation in Article 4(3) TEU does not alter that result.