52Furthermore, it must be stated in that connection that, if such a decision of the KZD is, as stated, subject to appeal before an administrative court whose decision is itself subject to appeal before the Varhoven administrativen sad, the existence of those judicial appeals ensures the effectiveness of the mechanism of the request for a preliminary ruling provided for in Article 267 TFEU and the uniform interpretation of European Union law and, in the present case, in particular of Directive 2000/43, that that provision of the Treaty seeks to ensure. Under Article 267 TFEU, such national courts have the option or, where appropriate, are required to make a request for a preliminary ruling to the Court where a decision on the interpretation or the validity of European Union law is necessary to give their judgment.
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