77It must be added that the application of the EU rules on State aid is based on an obligation of sincere cooperation between the national courts, on the one hand, and the Commission and the Courts of the European Union, 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 necessary measures, whether general or specific, to ensure fulfilment of the obligations under EU law and refrain from taking those which may jeopardise the attainment of the objectives of the Treaty, as follows from Article 4(3) TEU (judgment of 21 November 2013, Deutsche Lufthansa, C‑284/12, EU:C:2013:755, paragraph 41).
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