Judgment_paragraph 105 · Dimosia Epicheirisi Ilektrismou AE (DEI) and European Commission vAlouminion tis Ellados VEAE (C-590/14 P)

105It must be borne in mind that the application of the EU State aid rules is based on a duty of sincere cooperation between the national courts, on the one hand, and the Commission and the European Union courts, on the other, in the context of which each acts on the basis of the role assigned to it by the FEU Treaty. In the context of that cooperation, national courts must take all the measures, whether general or specific, necessary to ensure fulfilment of the obligations under EU law and must refrain from those that may jeopardise the attainment of the objectives of the Treaty, as follows from Article 4(3) TEU. Accordingly, national courts must, in particular, refrain from taking decisions that conflict with a decision of the Commission (judgment of 21 November 2013, Deutsche Lufthansa, C‑284/12, EU:C:2013:755, paragraph 41).