74As regards, first, the seriousness of the infringement, it must be borne in mind that the obligation to adopt national measures for the purposes of ensuring that a directive is transposed in full and the obligation to notify those measures to the Commission are fundamental obligations incumbent on the Member States in order to ensure optimal effectiveness of EU law and that failure to fulfil those obligations must, therefore, be regarded as undoubtedly serious (judgments of 8 July 2019, Commission v Belgium (Article 260(3) TFEU – High-speed networks), C‑543/17, EU:C:2019:573, paragraph 85; of 16 July 2020, Commission v Romania (Anti-money laundering), C‑549/18, EU:C:2020:563, paragraph 73; and of 16 July 2020, Commission v Ireland (Anti-money laundering), C‑550/18, EU:C:2020:564, paragraph 82).
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