30Accordingly, the situation of citizens of the Union who, like the applicant in the main proceedings, are nationals of one Member State only and who, by losing that nationality, are faced with losing the status conferred by Article 20 TFEU and the rights attaching thereto falls, by reason of its nature and its consequences, within the ambit of EU law. Thus, the Member States must, when exercising their powers in the sphere of nationality, have due regard to EU law and, in particular, the principle of proportionality (judgments of 2 March 2010, Rottmann, C‑135/08, EU:C:2010:104, paragraphs 42 and 45; of 12 March 2019, Tjebbes and Others, C‑221/17, EU:C:2019:189, paragraph 32; and of 18 January 2022, Wiener Landesregierung (Revocation of an assurance of naturalisation), C‑118/20, EU:C:2022:34, paragraph 51).
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