Britain's Prime Minister Theresa May speaks on the BBC's Marr Show in London, April 30, 2017. [Photo/Agencies]

LONDON－British Prime Minister Theresa May on Sunday denied she was "in a different galaxy" after European Union leaders were reportedly dismayed by her Brexit negotiating demands at a meeting this week.

May told European Commission President Jean-Claude Juncker and chief negotiator Michel Barnier that a detailed potential trade deal needed to be drawn up before Britain would agree to pay its EU divorce bill, according to the Sunday Times.

According to the paper, Juncker told German Chancellor Angela Merkel that May was "in a different galaxy," adding that it looked more likely now that no deal would be reached at all.

May told BBC's Andrew Marr Show that she stood by her earlier comment that "no deal was better than a bad deal", and rejected claims that her negotiating stance was unreasonable.

"I'm not in a different galaxy. What this shows is that there are going to be times when these negotiations are going to be tough," she said.

"I want to ensure we agree on a trade deal and withdrawal arrangements for...when we leave the European Union.

"And the EU has itself said that nothing is agreed until everything is agreed," she added, suggesting that further battles loom over the structure of the negotiations.

Luxembourg Prime Minister Xavier Bettel said the EU estimated the bill to be 40-60 billion euros ($42-65 billion), which mainly covers financial commitments made by the bloc while Britain was a member.

EU leaders unanimously backed a tough Brexit strategy at a summit on Saturday, demanding a "serious response" from Britain on the rights of European citizens before trade talks can start.

The summit was the first since May one month ago formally triggered the two-year process of untangling Britain from the EU after four decades of membership.