British and EU negotiators agreed Friday to intensify efforts to find a new Brexit withdrawal agreement, just days before a key European summit.
European Union member states will review progress from the talks on Monday, following a weekend meeting between French President Emmanuel Macron and German Chancellor Angela Merkel.
The stepped-up negotiations came after British Prime Minister Boris Johnson and Irish counterpart Leo Varadkar held a meeting Thursday both sides dubbed "promising".
That led to a Brussels working breakfast Friday between EU negotiator Michel Barnier and British Brexit minister Stephen Barclay to break the talks logjam.
The president of the European Council Donald Tusk, who hosts next week's summit, had said he would have pulled the plug on plans to discuss Brexit if there was no hope of progress.
But after Barnier's meetings the European Commission said: "The EU and the UK have agreed to intensify discussions over the coming days.
"The Commission will take stock with the European Parliament and member states again on Monday," it added, to allow ministers time to draw up the agenda of Thursday's EU summit.
Barnier's team has long been in "technical talks" with British officials, but without making enough progress towards a treaty text that could forestall a chaotic "no-deal" Brexit on October 31.
But after the "constructive" breakfast with Barclay, Barnier was given the go-ahead from member state ambassadors to begin a more political negotiation on a path towards a possible draft text.
This, officials said, could clear the way for a Brexit deal in the coming weeks -- or at least provide enough evidence of possible progress to justify postponing Britain's departure.
A European official told AFP the weekend talks were not a diplomatic "tunnel" -- from which no leaks were meant to escape -- of the kind that preceded the signing of a detailed withdrawal agreement last year, which was later rejected by British MPs.
"The Commission will explore what is possible in an intensive way," the source said.
"There's a good chance that it might all come to nothing, or not enough." Neither side revealed much detail about what was discussed at breakfast. But a diplomat told AFP: "At this stage, the less we hear, the better. If stuff starts leaking out, it means it's not serious."
Another European official close to the discussions suggested the restart was at an early stage, but that the process might suddenly accelerate: "We're completing the qualifiers for the 100-metre dash."
"Basically, the British are ready to evolve on the question of customs towards an all-island economy," a European source said, amid reports of a new customs arrangement for Northern Ireland.
The Commission said Brussels' position had not changed, and that any solution must avoid a hard border on the island of Ireland that would imperil peace and also that the EU's single market must be protected.
The key sticking point in the Brexit negotiations is how to handle the border between EU member Ireland and the British province of Northern Ireland, and on the role of the province's devolved assembly.
After a meeting in northwest England on Thursday, Johnson and Varadkar said they had "agreed that they could see a pathway to a possible deal".
Johnson has vowed Britain will end its near five-decade membership of the EU on October 31, with or without agreeing exit terms.
But he could be forced to seek a third delay to Brexit if he fails to agree a deal by October 19 because of a law passed by rebellious MPs.
Some European sources in Brussels have suggested that EU leaders may offer Britain an extension even if Johnson does not ask for one.
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