156In addition, in relations between Member States, account must be taken of the principle of sincere cooperation referred to in Article 4(3) TEU, which lays down an obligation for Member States, generally and thus, inter alia, in connection with situations governed by Directive 2009/16, to assist each other, in full mutual respect, in carrying out tasks which flow from the Treaties, to take any appropriate measure to ensure fulfilment of the obligations resulting from, inter alia, acts of the institutions of the Union, and to refrain from any measure which could jeopardise the attainment of the Union’s objectives.
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