France is preparing for the worst as the clock ticks down to Brexit, Finance Minister Bruno Le Maire said, adding that he does not have any more to give as Prime Minister Theresa May battles to break the deadlock.
Mr Le Maire said a no-deal Brexit would be catastrophic for Britain and that it was up to the government to find a solution before Britain leaves the European Union on 29 March.
He added that in the event of a no-deal, France could not ease the process by offering side deals on aviation or logistics.
"You can't be out of the EU and getting all the benefits of the single market," he told BBC radio.
"That is a clear red line for France."
Speaking from the World Economic Forum in Davos, Mr Le Maire said: "I'm afraid we have nothing to give.
"An agreement is an agreement and the responsibility of Brexit is clearly on the shoulders of the British government, not on the shoulders of the governments of the EU member states.
"It is up to the British government to find the right way out, not us, the European governments.
"If there is a need for any further clarifications, of course we are always open to clarifications.
"But reopening the deal would mean weeks, months, of new negotiations between the UK and the European member states, that is exactly what we want to avoid."
Asked whether it was possible to revisit the Irish backstop within the Withdrawal Agreement, Mr Le Maire added: "It is done. It is done and I think that we have to stick to the deal.
"I don't want to speculate on internal British policy because it is quite complicated and the UK is a sovereign country, but we don't have to speculate. It is up to the British government to take its decisions now."
Asked about whether no-deal measures taken by the EU would be as bad as some groups have suggested, including border delays between Dover and Calais, Mr Le Maire said: "We are aware that a no-deal situation would have concrete consequences and would force us to take some decisions to reinforce the control at our borders.
"So, there are many concrete consequences that would be a consequence of a no-deal situation. But we are prepared to do that."
The EU's Competition Commissioner said Ireland and the EU will "figure out" how to deal with a no-deal Brexit, if it arises.
Speaking on RTÉ's Morning Ireland, Margrethe Vestager said that ending with a no-deal Brexit, would be the "worst case scenario", adding that there is a risk for everyone involved.
When asked if she can see a way in which the integrity of the single market is protected without border infrastructure on the island of Ireland, she said that she is "absolutely sure" that they would find solutions that "everyone can live with", in the event of a no deal.
She said that the EU is standing firmly with Ireland on the issue.
Britain's finance minister Philip Hammond declined to rule out resigning if Mrs May decided to back a no-deal Brexit, putting some distance between himself and MPs including Work and Pensions Secretary Amber Rudd - who has also declined to rule out quitting over no-deal - over the importance of Tuesday's Brexit vote.
Speaking on BBC Radio he said: "What Amber is doing is reflecting a view among some of my colleagues that somehow next Tuesday is high noon, the last chance to make a stand against no-deal.
"I don't think that is the case, I don't think next Tuesday has to be, or indeed will be the high noon of this debate.
"Parliament will want to be confident that it will have an opportunity to express its clear view and some of my colleagues, including some who are in Government, will want to be able to express their view.
"But I don't think next Tuesday is the point when this comes to a head."
Mr Hammond showed the depth of the row inside the Cabinet over a no-deal Brexit, doubling down on his warnings about the damage it would cause to the economy.
He said: "What people were told in the referendum campaign, the majority who voted to leave, they were told that we would be able to get a deal with the European Union, that that would protect our jobs and our prosperity and that our exit could be smooth and orderly to a new relationship with the European Union.
"But it is absolutely clear that if we don't get a deal that is not the way it will work.
"There will be very significant disruption in the short term and a very significant hit to our economy in the medium to long term.
"Our job is to deliver the British people what they believe they were promised in that referendum, to make sure we respect the decision of the referendum but do it in a way that gives them the future prosperity they were promised."
Meanwhile, Britain's Queen Elizabeth has urged people to find "common ground" in comments that have been interpreted as a veiled reference to the debate over Brexit.
In a speech to mark the centenary of the Sandringham Women's Institute, she also extolled the virtues of "respecting" the other person's point of view.
She said: "Every generation faces fresh challenges and opportunities.
"As we look for new answers in the modern age, I for one prefer the tried and tested recipes, like speaking well of each other and respecting different points of view; coming together to seek out the common ground; and never losing sight of the bigger picture.
"To me, these approaches are timeless, and I commend them to everyone."
Additional Reporting Reuters