35As regards, in the second place, the second condition stated in Article 4(6) of Framework Decision 2002/584, as the Court has previously held, it follows from the wording of that provision that any refusal to execute a European arrest warrant presupposes an actual undertaking on the part of the executing Member State to enforce the custodial sentence imposed on the requested person. This indicates that any refusal to execute a European arrest warrant must be preceded by the executing judicial authority’s examination of whether it is actually possible to enforce the custodial sentence in question in accordance with its domestic law. In the event that the executing Member State finds that it is in fact impossible to undertake to enforce the sentence, it falls to the executing judicial authority to execute the European arrest warrant and, therefore, to surrender the requested person to the issuing Member State (judgment of 29 June 2017, Popławski, C‑579/15, EU:C:2017:503, paragraph 22).
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