The agreement signed between Kosovo and Serbia on 19th April was a stunning and major breakthrough; a significant compromise that opens the possibility of a normalization of relations for the two former belligerents and could unlock their accession path to the European Union. It was yet another vindication of the constructive and leading role played by the EU in the Balkans for over a decade, in stark contrast with the traumatic failures of the 1990s. Thus, even during the Eurozone turmoil, the EU can still remain a major diplomatic player. It was also a very sweet moment for the EU’s High Representative for Foreign Affairs and Security Policy, Catherine Ashton, who played an instrumental role in mediating the negotiations between Pristina and Belgrade. That accord will not be easy to implement, and will face some resistance. But it could prove a game changer in the Balkans, providing new momentum to the stalling process of reform in the various countries in the region and to their road to EU accession.