41It is also important to note that the application of the European Union 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 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 European Union law and refrain from those which may jeopardise the attainment of the objectives of the Treaty, as follows from Article 4(3) TEU. Therefore, national courts must, in particular, refrain from taking decisions which conflict with a decision of the Commission, even if it is provisional.
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