92Last, without prejudice to the limits placed on the possibility of reliance upon WTO law in order to review the legality of acts of the EU institutions before the Courts of the European Union, recalled in the case-law cited in paragraph 78 of the present judgment, it must be noted that the general international law principle of respect for contractual commitments (pacta sunt servanda), laid down in Article 26 of the Vienna Convention on the Law of Treaties of 23 May 1969 (United Nations Treaty Series, Vol. 1155, p. 331), means that the Court must, for the purposes of interpreting and applying the GATS, take account of the DSB’s interpretation of the various provisions of that agreement. In addition, should the DSB not yet have interpreted the provisions concerned, it is for the Court to interpret those provisions in accordance with the customary rules of interpretation of international law that are binding on the Union, while observing the principle, set out in Article 26, that that international agreement should be implemented in good faith.
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