The enlargement debate is back on the EU’s political agenda, including at this week’s European Council. While advancing a faster-track process for the candidate countries – and especially Ukraine – EU countries should not lose sight of the fact that an enlarged Union can’t just be a bigger version of the Union of today. The last time enlargement was intensively debated in the EU, in the early 2000s, ahead of the “big bang enlargement” of 2004, anxiety ran high across the continent. There were