This brief contribution uses a recent judgment of the Court of Justice of the European Union (ECJ) in the case of Janko Rottmann (C-138/08 [2010] ECR I-0000) as a pretext to look at the likely development of the citizenship of the European Union (EU) in the near future and, particularly, at the...

The current development of the EU citizenship concept is incompatible with some of the terms of enlargement, namely the policy of transition periods, outlined in the Act of Accession. While the ECJ has tried to interpret EU citizenship as a 'fundamental status', the 2003 Act of Accession...