There has been no significant progress this week, the EU chief negotiator Michel Barnier has said.
He has accused the UK of “backtracking” on its commitments in the latest round of post-Brexit trade talks.
“I don’t think we can go on like this forever,” Barnier added.
The two sides have been critical of each other’s negotiation stance.
The UK has until the end of June to ask for the “transition period” to be extended into next year. But Mr. Johnson has ruled this out.
“We have to use this time as efficiently as possible. We need more concentrated and more focused work on the more difficult issues in the next round end of June,” Barnier said.