"Things that broke down after Yugoslavia broke up but we are trying to help the economic union of the region and that will help them in the European Union membership in a long-term", Chakrabarti said.
In a declaration, EU leaders and member states agreed that the bloc welcomes the shared commitment of the Western Balkans partners to European values and principles, and to the vision of a strong, stable and united Europe.
The European Union would not be able to increase its influence in the Balkan region unless there is "coherence or unity" within the bloc, the French president noted.
Austrian Chancellor Sebastian Kurz, whose country will take over the EU's rotating presidency in July, stressed the importance of keeping the door open.
Last month, the European Commissioner for Digital Economy and Society, Mariya Gabriel, said the Commission is working to deliver a Digital Agenda for the Western Balkans as a flagship initiative during the Sofia summit.
"We want to demonstrate that we care about socioeconomic development in the region here and now".
German Chancellor Angela Merkel also played down Balkan membership of the EU.
However, Merkel added: "As for compensating all businesses in a comprehensive way for such measures by the United States of America, I think we can not and must not create illusions".
The summit was also marred by long-standing frictions both within and between the Balkan states and the larger bloc. Officials from the two countries have been locked in talks over the issue.
Even the Macedonian and Greek leaders, Zoran Zaev and Alexis Tsipras, who made the most substantive breakthrough of the day, were careful to lay out the road of domestic negotiations about the "name" compromise that lies ahead, instead of focusing on the achievement itself. "I believe we have covered a major part of the distance, but there is still distance to cover", he said. Madrid is one of the few countries that doesn't recognise Kosovan independence from Serbia - declared in 2008, amid fears it could set a precedent regarding the Catalan region of Spain.
But, highlighting how long and hard their road to membership is likely to be, Prime Minister Mariano Rajoy of European Union member Spain stayed away from the talks since Madrid refuses to recognise the independence of Kosovo.