15In that regard it should be recalled that in proceedings under Article 267 TFEU, which are based on a clear separation of functions between the national courts and the Court of Justice, it is solely for the national court before which the dispute has been brought, and which must assume responsibility for the subsequent judicial decision, to determine, in the light of the particular circumstances of the case, both the need for a preliminary ruling in order to enable it to deliver judgment and the relevance of the questions which it submits to the Court. Consequently, where the questions referred concern the interpretation of European Union law, the Court of Justice is, in principle, bound to give a ruling (see, inter alia, Case C-561/11 Fédération Cynologique Internationale [2013] ECR, paragraph 26 and the case-law cited).
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