Access to citizenship remains within core national competences. However, according to primary EU law (Article 9 of the Treaty on EU and Article 20 of the Treaty on the Functioning of the EU), acquisition of a national citizenship within the EU entails automatic access to EU citizenship and to enjoyment of the rights deriving therefrom – such as, for example, the right to move and reside freely within the territories of EU Member States. Consequently, as it is established by the European Court of Justice’s case law, Member States “must have due regard” to the European Union law, when defining terms for acquisition or loss of nationality.
