Prime Minister Boris Johnson insisted Saturday that Britain is ready to accept the consequences of no-deal if common ground can not be found, AFP said.
In bullish language, Mr Frost insisted that United Kingdom sovereignty over laws, courts, and fishing waters was "not up for discussion". Tuesday marks the deadline for the agreement of any extension to the negotiating timetable, but Johnson has repeatedly signalled that his government is unwilling to agree to an extension. "We have been warning about this for the past three years", he said.
"UK sovereignty, over our laws, our courts, or our fishing waters, is of course not up for discussion".
"The government will not agree to ideas like the one now circulating giving the European Union a new right to retaliate with tariffs if we chose to make laws suiting our interests", he tweeted.
"We could not leave ourselves open to such unforeseeable economic risk".
Mr Frost said he was looking forward to the resumption of face-to-face talks in the wake of the coronavirus outbreak.
The latest round of Brexit trade talks gets underway in Brussels on Monday, with both sides hoping to break the deadlock that has stymied discussions so far.
Now, Barnier has uped the ante, saying his team ready to "make the most" of the intensified process over the coming weeks and months. "We will be constructive, as we have always been, and respectful, and we are ready to be creative to find common ground", Barnier told the European Policy Centre in Brussels last week. German Chancellor Angela Merkel - whose government takes over the presidency of the European Union next week - has also sharpened her public stance, questioning whether London actually wants a deal.
"These meetings will be smaller and focused on seeing whether we can begin to make genuine and rapid progress towards an agreement".
Some 30% of German companies fear Britain and the European Union will fail to reach a deal on their future relationship before a transition period that ends on December 31, a survey published on Friday showed.