US President Joe Biden will deliver “tough messages” to Vladimir Putin when he meets the Russian leader in Geneva later this week, Boris Johnson has said.
It comes as world leaders gather for a Nato summit today in Brussels, with discussions about Russia high on the agenda.
“The United Kingdom needs to pay attention to its reputation,” Mr Barnier told French radio. “I want Mr Johnson to respect his signature.”
His intervention came after Joe Biden urged Boris Johnson to ensure the Northern Ireland peace process was protected amid a bitter row between London and Brussels over post-Brexit trading arrangements.
National security adviser Jake Sullivan said the US president had held a “candid discussion” with the prime minister about the issue at the G7 summit in Cornwall, which ended on Sunday.
EU politicians have accused the prime minister of not respecting agreements made during the Brexit negotiations in a row that overshadowed the meeting of world leaders in Carbis Bay.