BRUSSELS — Their proclivity to divide, fight and break up was such that it became a verb — to balkanize. Now, the European Union wants to unite Balkan nations in the fold of a united continent, smothering any remaining enmity in cooperation and the promise of prosperity.
In one fell swoop on Friday, EU leaders welcomed Croatia as the club's newest member, agreed to open membership talks with Serbia and held out the promise of open trade and political cooperation with Kosovo.
After wars in the former Yugoslavia of the 1990s filled the rest of Europe with dread, EU leaders are slowly shedding their reticence and moving into one of the continent's most perilous areas.
"The European Union is courageous enough," said European Parliament President Martin Schulz at an EU summit in Brussels that wrapped up Friday.
Serbian President Tomislav Nikolic said the EU decision means that Serbia has restored its image abroad "even among those countries that do not like us very much."
"But all of them speak of Serbia with respect now," Nikolic said.
The prime minister of Croatia, which battled Serbia in the 1990s, welcomed the leaders' decision to give the go-ahead to talks with other Balkan nations.
"Their absence from the EU creates a sort of strategic gap in the European belly," Croatian Prime Minister Zoran Milanovic told reporters in Brussels, where he joined other leaders as an honorary guest. Croatia formally joins the EU on Monday after nearly a decade of negotiations.