EU and UK negotiators have pressed on with talks with no sign of them breaking an impasse over post-Brexit fishing rights in time to save a trade deal.
"It remains very blocked," one EU diplomat told AFP as talks continued on Saturday.
Another said Brussels had made Britain its last offer on fishing access and it was down now to UK Prime Minister Boris Johnson to decide whether he wants a deal.
"If Britain doesn't accept the latest EU offer, it will be a 'no deal' over fish," he warned.
Barnier has proposed EU fishermen giving up nearly a quarter of the value of the fish they currently catch in UK waters.
Britain is understood to be holding out for getting back much more than half.
The UK has suggested this compromise last for three years before it is renegotiated, whereas Europe is holding out for seven. "It's all down to numbers now," the second European diplomat said.
READ MORE: UK, EU head for 'last attempt' to reach post-Brexit trade deal
'Matter of hours'
The EU's point man in the talks, Michel Barnier, has consulted member states that share fishing waters with Britain, but has been told to stand his ground.
The European Parliament has highlighted a deadline of 2300GMT (midnight) on Sunday to receive a deal for review if MEPs are to ratify it before the end of the year.
Their UK parliamentary counterparts are in recess, but can be recalled within 48 hours to do likewise.
But EU capitals are not binding themselves to the European Parliament's deadline. The second diplomatic source said Britain effectively had until the end of the year to make its mind up.
France's European affairs minister, Clement Beaune, warned that time left to get a deal was "a matter of hours", echoing words used by Barnier a day earlier.
But, he told French radio, talks will not be called to a halt even if they go past Sunday.
"We won't do that because what is at risk is whole sectors like fishing, like sustainable competition conditions for our businesses," he said.
READ MORE:EU: Brexit deal with Britain is possible
Brexit disruption 'inevitable'
The urgency of reaching a deal is being driven home by scenes of long lines of trucks at the freight rail link through the Channel tunnel as British companies frantically stockpile.
A group of UK MPs warned that Britain has not installed the complex IT systems and port infrastructure needed to ensure trade with the EU runs smoothly.
Some disruption is inevitable whether a deal happens or not.
Outside the single market, British and European traders will have to fill out import-export, health and tax forms to send and receive goods.
A deal would lighten that burden by removing tariffs, but there would still be traffic snarls as checks on truck loads and drivers' papers are carried out.
Even truck drivers' lunches will come under border scrutiny: the British government warned packed ham and cheese sandwiches are banned from entry into Europe under meat and dairy restrictions that apply to non-EU arrivals.
READ MORE: Royal Navy to patrol UK fishing waters in case of no-deal Brexit
