Bartłomiej Nowak “Demystifying European Enlargement: Lessons for Ukraine and Brussels” – text published on 16th December 2013 in the “Expert commentary” on The German Marshall Fund of the United States. The EU should play a hardball: use its power of a 'gate-keeper’, admit that it is still an open project and that the article 49 of TEU is valid. It would cost European leaders nothing, except a little courage. Ukraine would have no excuse.

Full version of Bartek Nowak’s article:
http://blog.gmfus.org/2013/12/16/demystifying-european-enlargement-lessons-for-ukraine-and-brussels/