211In that regard, it need simply be stated that, even assuming that those requirements constitute such a national standard of protection, the fact remains that, when a court of a Member State is called upon to review the compatibility with fundamental rights of a national provision or measure which, in a situation in which the action of the Member States is not entirely determined by EU law, implements EU law for the purposes of Article 51(1) of the Charter, Article 53 of the Charter confirms that national authorities and courts are free to apply national standards of protection of fundamental rights, provided that the level of protection provided for by the Charter, as interpreted by the Court, and the primacy, unity and effectiveness of EU law are not thereby compromised (judgments of 26 February 2013, Åkerberg Fransson, C‑617/10, EU:C:2013:105, paragraph 29; of 26 February 2013, Melloni, C‑399/11, EU:C:2013:107, paragraph 60; and of 29 July 2019, Pelham and Others, C‑476/17, EU:C:2019:624, paragraph 80).
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