0903 GMT March 01, 2021
Barnier also described British delays in spelling out what kind of trade relationship London wants as "a game of hide and seek" in remarks prepared for delivery to a gathering in Portugal of jurists specialized in EU law, Reuters reported.
He chided British criticism of EU positions as a "blame game", urging London to recognize that it could not retain many elements of EU membership after Brexit.
The sharp tone of the former French minister's remarks follow several days of talks in Brussels between his team of EU negotiators and British counterparts, after which a senior EU official dismissed as "fantasy" both London's overall proposals for future close relations and an offer to avoid a disruptive "hard border" between Northern Ireland and EU member Ireland.
British ministers said those remarks were not "helpful".
Barnier said he was ready to have "political level" talks to try to advance in three key areas where uncertainty remains, 10 months before Britain is due to leave in March 2019 – how to rule on future disputes over the withdrawal treaty, a "backstop" solution for the Irish border and a framework for future ties.
Referring to discussions within Prime Minister Theresa May's government on whether to drop an insistence on having no customs union, he said: "If the United Kingdom would like to change its own red lines, it must tell us. The sooner the better."
"We are asking for clarity," he added. "A negotiation cannot be a game of hide and seek."
On the issue of the governance of a withdrawal treaty, which both sides hope to have ready around October, Barnier repeated the EU's insistence that primacy of the European Court of Justice inside the Union be maintained in regulating any dispute that could not be resolved by a joint committee appointed by the political leadership of the two sides.