Boris Johnson‘s chief Brexit negotiator will warn Brussels the UK must be able to set its own laws as the battle over the future trading relationship begins in earnest.

In his first public intervention, David Frost will tell an audience in Brussels that anyone who believes the UK could abide by EU rules “fails to see the point of what we are doing”.

He will insist that the UK is not bluffing over its opposition to “EU supervision” on so-called level playing field issues, which include vital protections for workers and the environment.

It comes as France’s foreign minister warned the two sides would “rip each other apart” in trade talks ahead of the end of the Brexit transition period in December.

Mr Frost will outline the UK’s position in lecture at the Universite libre de Bruxelles on Monday, in a move that marks a significant departure from the secrecy that surrounded Theresa May’s approach to the Brexit negotiations.

He was expected to say: “We bring to the negotiations not some clever tactical positioning but the fundamentals of what it means to be an independent country.

“It is central to our vision that we must have the ability to set laws that suit us – to claim the right that every other non-EU country in the world has.

“So to think that we might accept EU supervision on so called level playing field issues simply fails to see the point of what we are doing.

“It isn’t a simple negotiating position which might move under pressure – it is the point of the whole project.

“That’s also why we will not extend the transition beyond the end of this year. At that point we recover our political and economic independence in full – why would we want to postpone it?”

The prime minister’s Europe adviser will argue that the UK’s standards of regulation are often higher than the EU and that democratic consent “would snap” if either side was forced to accept the other’s rules.

Brexit day: UK says goodbye to EU Show all 66 1 /66 Brexit day: UK says goodbye to EU Brexit day: UK says goodbye to EU A message projected onto the White Cliffs of Dover Sky News/AFP via Getty Brexit day: UK says goodbye to EU LONDON, ENGLAND - JANUARY 31: Pro Brexit supporters attend the Brexit Day Celebration Party hosted by Leave Means Leave at Parliament Square on January 31, 2020 in London, England. At 11.00pm on Friday 31st January the UK and Northern Ireland exits the European Union, 188 weeks after the referendum on June 23rd, 2016. (Photo by Jeff J Mitchell/Getty Images) Jeff J Mitchell Getty Brexit day: UK says goodbye to EU Big Ben, shows the hands at eleven o'clock at night AFP via Getty Images Brexit day: UK says goodbye to EU Nigel Farage speaks to pro-Brexit supporters PA Brexit day: UK says goodbye to EU Pro-Brexit demonstrators celebrate on Parliament Square REUTERS Brexit day: UK says goodbye to EU The Union flag is taken down outside the European Parliament in Brussels PA Brexit day: UK says goodbye to EU Pro-EU campaigners outside the Scottish Parliament, Edinburgh PA Brexit day: UK says goodbye to EU A pro-Brexit supporter jumps on an EU flag in Parliament Square PA Brexit day: UK says goodbye to EU EU Council staff removed the Union Jack-British flag from the European Council in Brussels, Belgium EPA Brexit day: UK says goodbye to EU A pro-Brexit supporter pours beer onto an EU flag PA Brexit day: UK says goodbye to EU Pedestrians pass in front of the Ministry of Defence Building on Whitehall, illuminated by red, white and blue lights in central London AFP via Getty Images Brexit day: UK says goodbye to EU A Brexit supporter shouts during a rally in London AP Brexit day: UK says goodbye to EU Pro-EU campaigners outside the Scottish Parliament, Edinburgh PA Brexit day: UK says goodbye to EU Pro-EU campaigners take part in a 'Missing EU Already' rally outside the Scottish Parliament, Edinburgh PA Brexit day: UK says goodbye to EU A large pro-EU banner is projected onto Ramsgate cliff in Kent PA Brexit day: UK says goodbye to EU Pro-EU supporters light candles in Smith Square in Westminster PA Brexit day: UK says goodbye to EU A man waves Union flags from a small car as he drives past Brexit supporters gathering in Parliament Square AFP via Getty Images Brexit day: UK says goodbye to EU The five-year old Elisa Saemann, left, and her seven-year old sister Katie hold a placard during a rally by anti-Brexit protesters outside the Scottish parliament in Edinburgh AP Brexit day: UK says goodbye to EU Pro Europe supporters gather on Brexit day near the British embassy in Berlin, Germany EPA Brexit day: UK says goodbye to EU Anti-Brexit protester hugs a man while holding a placard REUTERS Brexit day: UK says goodbye to EU A decorated, old fashioned fire pump in Parliament Square PA Brexit day: UK says goodbye to EU Pro Brexit Elvis impersonator performs at Parliament Square Getty Images Brexit day: UK says goodbye to EU An anti-Brexiteers stands with his dog in Parliament Square AFP via Getty Images Brexit day: UK says goodbye to EU Paddy from Bournemouth wears Union colours as he sits next to an EU flag decorated bag in Parliament Square AFP via Getty Images Brexit day: UK says goodbye to EU A pro-EU activist plays a guitar decorated with the EU flag during a protest organised by civil rights group New Europeans outside Europe House, central London AFP via Getty Images Brexit day: UK says goodbye to EU People celebrate Britain leaving the EU REUTERS Brexit day: UK says goodbye to EU A Pro Brexit supporter has a Union Jack painted onto his face at Parliament Square Getty Images Brexit day: UK says goodbye to EU Men hold placards celebrating Britain leaving the EU REUTERS Brexit day: UK says goodbye to EU Pro Brexit supporters dance in the street draped with Union Jack flags at Parliament Square Getty Images Brexit day: UK says goodbye to EU An anti-Brexit demonstrator spreads his wings during a gathering near Downing Street AP Brexit day: UK says goodbye to EU Pro EU supporters display a banner ' Here to Stay, Here to Fight, Migrants In, Tories Out' from Westminster bridge EPA Brexit day: UK says goodbye to EU Pro-Brexit supporters burn European Union flags at Parliament Square Getty Brexit day: UK says goodbye to EU A man poses for a picture on Parliament Square in a 'Brexit Day' t-shirt Reuters Brexit day: UK says goodbye to EU People celebrate Britain leaving the EU Reuters Brexit day: UK says goodbye to EU A pro-EU anti-Brexit protester holds up a placard showing Britain's Prime Minister Boris Johnson and US businesswoman Jennifer Arcuri in Parliament Square in central London on January 31, 2020 on the day that the UK formally leaves the European Union. - Britain on January 31 ends almost half a century of integration with its closest neighbours and leaves the European Union, starting a new -- but still uncertain -- chapter in its long history. (Photo by Glyn KIRK / AFP) (Photo by GLYN KIRK/AFP via Getty Images) GLYN KIRK AFP via Getty Brexit day: UK says goodbye to EU A man wears a pro-Brexit t-shirt Reuters Brexit day: UK says goodbye to EU Anti-Brexit demonstrators visit Europe House to give flowers to the staff on Brexit day Reuters Brexit day: UK says goodbye to EU Pro Brexit supporter wears a novelty Union Jack top hat outside the Houses of Parliament Getty Images Brexit day: UK says goodbye to EU Customers Scott Jones and Laura Jones at the Sawmill Bar in South Elmsall, Yorkshire, where a Brexit party is being held throughout the day PA Brexit day: UK says goodbye to EU A pro-Brexit demonstrator clenches his fist during a rally in London, Friday, Jan. 31, 2020. Britain officially leaves the European Union on Friday after a debilitating political period that has bitterly divided the nation since the 2016 Brexit referendum. (AP Photo/Alberto Pezzali) Alberto Pezzali AP Brexit day: UK says goodbye to EU LONDON, ENGLAND - JANUARY 31: Pro-EU activists protest at Parliament Square as people prepare for Brexit on January 31, 2020 in London, United Kingdom. At 11.00pm on Friday 31st January the UK and Northern Ireland will exit the European Union 188 weeks after the referendum on June 23rd 2016. (Photo by Jeff J Mitchell/Getty Images) Jeff J Mitchell Getty Brexit day: UK says goodbye to EU LONDON, ENGLAND - JANUARY 31: Pro Brexit supporters hold up placards at Parliament Square as people prepare for Brexit on January 31, 2020 in London, United Kingdom. At 11.00pm on Friday 31st January the UK and Northern Ireland will exit the European Union 188 weeks after the referendum on June 23rd 2016. (Photo by Jeff J Mitchell/Getty Images) Jeff J Mitchell Getty Images Brexit day: UK says goodbye to EU Pro-EU activists protest Getty Images Brexit day: UK says goodbye to EU A pro-Brexit demonstrator burns a European Union flag AP Brexit day: UK says goodbye to EU Pro Brexit supporters Getty Images Brexit day: UK says goodbye to EU Pro Brexit supporters Getty Images Brexit day: UK says goodbye to EU A Brexit supports holds a sign in Parliament Square AP Brexit day: UK says goodbye to EU A man carries an EU themed wreath Reuters Brexit day: UK says goodbye to EU Ann Widdecombe reacts with other members of the Brexit party as they leave en masse from the European Parliament PA Brexit day: UK says goodbye to EU Anti-Brexit demonstrators in Parliament Square PA Brexit day: UK says goodbye to EU Pro EU supporters let off flares from Westminster Bridge Getty Brexit day: UK says goodbye to EU British MEPs Jonathan Bullock, holding the Union Jack flag and Jake Pugh leave the European Parliament, in Brussels on the Brexit day AFP via Getty Brexit day: UK says goodbye to EU Newspapers and other souvenirs at a store, near Parliament Square Reuters Brexit day: UK says goodbye to EU Brexit supporters hold signs in Parliament Square AP Brexit day: UK says goodbye to EU Pro-EU protesters hold placards in Parliament Square AFP via Getty Brexit day: UK says goodbye to EU French newspapers PA Brexit day: UK says goodbye to EU Sinn Fein leader Mary Lou McDonald with a Border Communities Against Brexit poster before its unveiling in Carrickcarnon on the Irish border PA Brexit day: UK says goodbye to EU National growers organisation British Apples & Pears has renamed a British apple to EOS, the Greek goddess of dawn, to commemorate Brexit day AP Brexit day: UK says goodbye to EU Pro-EU protesters hold placards in Parliament Square AFP via Getty Brexit day: UK says goodbye to EU Britain's departure from the European Union was set in law on January 29, amid emotional scenes, as the bloc's parliament voted to ratify the divorce papers. After half a century of membership and three years of tense withdrawal talks, the UK will leave the EU at midnight Brussels time (23.00 GMT) on January 31 Reuters Brexit day: UK says goodbye to EU A man poses with paintings on Parliament Square Reuters Brexit day: UK says goodbye to EU People sporting Union Flags gather in Parliament Square Getty Brexit day: UK says goodbye to EU A man walks with a St. George's flag at Westminster bridge on Brexit day Reuters Brexit day: UK says goodbye to EU A British bulldog toy and other souvenirs at a souvenir store Reuters Brexit day: UK says goodbye to EU British pro-brexit Members of the European Parliament leave the EU Parliament for the last time Reuters Brexit day: UK says goodbye to EU Jonathan Bullock waves the Union Jack as he leaves the European Parliament EPA

“How would you feel if the UK demanded that, to protect ourselves, the EU dynamically harmonise with our national laws set in Westminster and the decisions of our own regulators and courts,” Mr Frost will ask.

He will call for “open and fair competition provisions” in any free trade agreement and say both sides must build on other EU trade deals to strike a bargain.

The call comes after French foreign minister Jean-Yves le Drian predicted a bruising battle on a post-Brexit deal.

Speaking at the annual Munich Security Conference, he said: “I think that on trade issues and the mechanism for future relations, which we are going to start on, we are going to rip each other apart.