Bosnia-Herzegovina has applied to join the EU, the President of the European Commission Federica Mogherini has said.
At an event in Brussels, diplomats indicated Sarajevo may not have met all the conditions required to submit an application.
Nonetheless, Ms Mogherini said the 28 EU states would now analyse the application, and she said it was good news for the bloc and for Bosnia, a former Yugoslav republic where a 1990s war killed 100,000 people.
"At a time when the Union is questioned from within, seeing that with our immediate neighbours there is such an energy and willingness to join and work hard to adapt their countries, society, economy, institutions, systems to the European standards, gives us the sense of responsibility we have also towards our European Union citizenship," she told journalists.
More to follow