France's defence minister has cancelled talks with her UK counterpart amid the row prompted by a new security deal between Britain, the US and Australia.
Paris is angry after Australia signed the Aukus pact to build nuclear-powered submarines, pulling out of a major contract with France in the process.
UK PM Boris Johnson said France had nothing to worry about from the deal.
But Florence Parly's meeting with UK Defence Secretary Ben Wallace in London this week has been called off.
Lord Ricketts, a former British ambassador to France who was due to co-chair the two days of talks, confirmed the meeting had been "postponed to a later date".
'Very friendly relationship'
Foreign Office minister James Cleverly told BBC Breakfast that "all bilateral relationships go through periods of tension", but added: "I have absolutely no doubt that ultimately our relationship with France will endure."
He said the pact with Australia and the US was intended to "strengthen and deepen" the relationship with two long-standing defence partners and to support high-tech manufacturing and technology companies across the UK.
The Aukus agreement brokered last week, widely seen as an effort to counter China's influence in the contested South China Sea, ended a deal worth $37bn (£27bn) signed by Australia in 2016 for France to build 12 conventional submarines.
French foreign minister Jean-Yves Le Drian has described it as a "stab in the back" that constitutes "unacceptable behaviour between allies and partners".
And in a rare step among allies, French President Emmanuel Macron ordered the recall of the French ambassadors to Washington and Canberra.
The European Union has said it was "analysing" the impact of the Aukus agreement on its trade negotiations with Australia, which are due to resume in October.
BBC Brussels correspondent Jessica Parker said it appeared the EU had hardened up its position over the weekend, as the extent of France's anger became clear.
She said the commission wouldn't elaborate on what "analysing" the impact of Aukus could actually mean for the trade talks with Australia - but the language might lead to speculation that negotiations could even be suspended.
Speaking on a flight to New York, where he will take part in the UN General Assembly, Mr Johnson said France should not "worry" about the alliance, insisting that Anglo-French relations were "ineradicable".
The prime minister said Britain and France had a "very friendly relationship", which he described as being of "huge importance".
"Our love of France is ineradicable," he told reporters.
"Aukus is not in any way meant to be zero-sum, it's not meant to be exclusionary. It's not something that anybody needs to worry about and particularly not our French friends."
