BRUSSELS (AP) — As Britain battles to leave the European Union, two countries from the Balkans were struggling to be allowed in Thursday, despite warnings that turning them away would tarnish the EU's reputation and could risk inflaming the volatile region.

Albania and North Macedonia were expecting this week to receive a green light to begin negotiations on joining Europe's rich club. The European Commission, which supervises entry talks, insists that both have met all the criteria. EU leaders had promised a decision on their futures by the end of October.

But French President Emmanuel Macron is refusing to allow any new countries into the 28-nation bloc until its enlargement procedures have been improved, while The Netherlands opposes Albania's candidacy and disputes the commission's assessment.

Visiting Brussels on Wednesday, on the eve of an EU summit where their files are being discussed, North Macedonia Prime Minister Zoran Zaev recalled the leaders' promise to cast their verdict this month.

"October is here. We came here to Brussels and we're expecting the well-deserved news on the decision to open negotiations," Zaev said, adding that if no news comes, "then the credibility of the EU and the trust that our citizens have in the Union might be brought into question."

"This will most certainly incite regressive forces in the country and will strengthen the interest of third parties in the region," he said, in what appeared to be a veiled reference to Russia's influence in the Balkans.

The prospect of EU membership has been a powerful driving force for reforms in the Balkans since the former Yugoslavia disintegrated into war in the early 1990s. Croatia and Slovenia have joined; others are waiting, more or less patiently.

The EU has always said that membership is based on a candidate's merits, but in the case of Albania and North Macedonia the merits acknowledged by the commission do not appear to be receiving their just reward.

EU foreign policy chief Federica Mogherini warned in May that any "failure to recognize and respond to objective progress would damage the European Union's credibility." She said it could also "undermine stability and seriously discourage further reforms."

Her warning came just after Serbia put its troops on full alert after heavily armed Kosovo police fired tear gas and arrested about two dozen people in Serb-dominated northern Kosovo in what they called an anti-organized crime operation.

EU-backed talks between the two on normalizing relations are bogged down.

But the constant expansion of the EU over the years has complicated decision-making in the world's biggest trade bloc, and a kind of "enlargement fatigue" had set in. Turkey's membership talks, for example, are virtually frozen.

On taking up his post as commission president in 2014, Jean-Claude Juncker vowed that no countries would join during his term, which is set to end in a few weeks.

On Tuesday, EU ministers failed again to reach any consensus on the cases of Albania and North Macedonia. There seemed little appetite even for separating their cases and allowing one to start talks.

"It was not a moment of glory for Europe," Enlargement Commissioner Johannes Hahn said. He apologized to the citizens of the two Balkans hopefuls, and said that "the overwhelming majority" of EU member countries supported them.

He said he hopes EU leaders can break the deadlock at this week's summit "in order to restore our credibility."

But their chances appeared slim. A top French diplomat said Thursday that not enough progress has been made to fix the EU's enlargement shortcomings. She said Paris could change its mind over the next six months if North Macedonia passes more reforms and if Albania does more to stop its citizens from seeking asylum in France.

The incoming commission president, Ursula von der Leyen, said that "unfortunately, the signs are not good. And it's not sure there will be a decision today. I regret it because I firmly believe that both countries have made enormous efforts to approach European standards."

AP Writer Samuel Petrequin in Brussels contributed to this report.