Cittadinanza dell’Unione e cittadinanze nazionali: una reciproca (e fruttuosa) interdipendenza

The present article analyses the issue of the acquisition and the loss of the European citizenship in connection with the nationality of a Member State. The opportunity thereof is offered by a recent judgment of the Court of Justice of the European Union on the loss of the EU citizenship due to a risk of statelessness. A brief examination of the key points of the well-known previous case-law of the Court of Justice is followed by an in-depth exam of the principle of proportionality, which is detailed in the latest case JY. Furthermore, the article investigates the impact of the loss of citizenship and of the principle of proportionality in the Brexit process, taking also into account some recent EU Member States’ legislations on national citizenship as well as the nature of EU citizenship with respect to the EU Member States’ nationalities.