Eastern European states are angered by the EU's "mistake" as Macron leads blocking EU accession membership talks for Albania and North Macedonia.
The EU has made a "historic mistake" that risks destabilising the Balkans, senior officials warned on Friday, after a handful of countries led by French President Emmanuel Macron again blocked membership talks for North Macedonia and Albania.
There was widespread frustration and disappointment, particularly among eastern European countries keen to broaden the EU club, at the failure of the 28 leaders to agree to start formal accession negotiations with Skopje and Tirana.
Leaders were deadlocked after some seven hours of heated backroom wrangling at a Brussels summit, with France alone in rejecting North Macedonia but joined by Denmark and the Netherlands in refusing Albania.
"It's a major historic mistake and I hope it will only be temporary and won't become engraved in the collective memory as a historic mistake," European Commission chief Jean-Claude Juncker said.
Johannes Hahn, the European commissioner who has led efforts to push the two countries to reform to fit EU norms, said it had left the bloc's credibility damaged "not only in the Western Balkans but beyond."
"This is a matter of extreme disappointment," he tweeted.
"To refuse acknowledgement of proven progress will have negative consequences, including the risk of destabilisation of the Western Balkans, with full impact on the EU."
North Macedonian President Stevo Pendarovski urged his people to push on with reform despite the disappointment, while his Foreign Minister Nikola Dimitrov urged the EU to come clean about its true intentions.
"If there is no more consensus on the European future of the Western Balkans... the citizens deserve to know," he tweeted.
German Chancellor Angela Merkel said EU leaders would look again at the matter before a summit with Western Balkans leaders in Zagreb early next year.
The summit deadlock came days after EU ministers hit a similar impasse at talks in Luxembourg — following two earlier delays by EU countries on making a decision.
Apart from France, all the other EU states accept that North Macedonia has made enough progress on reforms — including changing its name from Macedonia to appease Greece — to start talks.
But Albania has less support, with the Netherlands and Denmark joining France in voicing serious reservations about its efforts against corruption and organised crime.
Austrian Chancellor Brigitte Bierlein said the summit failure was "extremely regrettable."
"I have spoken to the two prime ministers to express my great disappointment, and they are also extremely disappointed," she told reporters in Brussels.
"This is not a good sign for the solidarity of the EU or the stability of the region."
EU Council President Donald Tusk told reporters he felt "really embarrassed" but urged the two countries not to lose heart, saying he had "absolutely no doubt" they would one day join the bloc.
"Both countries, they passed their exams, I can't say this about our member states," Tusk said.
The European Commission has said both countries have done enough to at least begin talks, but Macron now says this should not happen until the whole accession process has been reformed, arguing that it does not work properly.
But diplomats suspect the French are playing tough for domestic political reasons linked to immigration, and there is frustration that Macron appears to be trying to move the goalposts.
"These countries deserve it, they fulfil the criteria, the momentum is right," said one diplomatic source.
"It's not fair to change the rules of the game in the middle of the game."
Another said "there's no logic to it. It's incoherent — an excuse."
After the earlier failure in Luxembourg, another diplomat accused France of "repeating the same stupid arguments again and again," warning Paris would bear "responsibility for the consequences of this."
Politicians in North Macedonia and Albania have warned that their people's patience with the EU is not unlimited and repeated rejections risk emboldening nationalist and pro-Russian forces.