51It follows that the validity of an act of the European Union may be affected by the fact that it is incompatible with such rules of international law. Where such invalidity is pleaded before a national court, the Court of Justice ascertains, as is requested of it by the referring court’s first question, whether certain conditions are satisfied in the case before it, in order to determine whether, pursuant to Article 267 TFEU, the validity of the act of European Union law concerned may be assessed in the light of the rules of international law relied upon (see, to this effect, Intertanko and Others, paragraph 43).
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