42It would be difficult for the Union to carry out its task effectively if the principle of loyal cooperation, requiring in particular that Member States take all appropriate measures, whether general or particular, to ensure fulfilment of their obligations under European Union law, were not also binding in the area of police and judicial cooperation in criminal matters, which is moreover entirely based on cooperation between the Member States and the institutions, as the Advocate General has rightly pointed out in paragraph 26 of her Opinion.
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