When will Europe be finally united?

Twenty years ago, after the wars in ex-Yugoslavia, the European Union said that the future of the western Balkan countries would be within the European Union. They would, as soon as possible, join the EU. Today, however, Serbia, Kosovo, Albania and the others, still don't belong to the EU. Why is that? Willen de huidige EU-landen dan geen verenigd Europa? Of willen deze landen het zelf niet meer? Vjosa Musliu is politicoloog aan de VUB en legt (in het Engels!) uit wat het probleem is.