Emmanuel Macron has warned Donald Trump about "fits of anger" after the US president refused to endorse a joint communique of G7 leaders.
In an attack on Canada's "very dishonest and weak" Prime Minister Justin Trudeau, Mr Trump revealed he was tearing up the agreed communique from the G7 gathering in Charlevoix, Canada.
The president's Twitter outburst, sent as he flew to an historic meeting with North Korea's ruler Kim Jong Un in Singapore, unravelled days of work by the world's top nations in attempting to resolve a global trade dispute.
Despite Mr Trump's actions, the UK, France and Germany have insisted they will stand by the commitments made at the summit.
Paris also delivered a withering response to the US president's tweeted instruction for American officials to withhold their endorsement.
The French president's office said in a statement: "International co-operation cannot be dictated by fits of anger and throwaway remarks.
"We spend two days working out a [joint] statement and commitments. We are sticking to them and whoever reneges on them is showing incoherence and inconsistency.
"Let's be serious and worthy of our people. We make commitments and keep them."
The statement added "France and Europe maintain their support" for the G7 conclusions.
The response from Mr Macron suggests an end to what observers had noted was a budding "bromance" between the French president and Mr Trump.
Last year, the US president was wowed by a French military parade in Paris after being invited to join Mr Macron for his country's annual Bastille Day celebrations.
In return, Mr Trump made the French president his guest at his first White House state dinner, after which the US president said of his visitor: "I like him a lot."
The acrimonious fallout from the G7 began after Mr Trump watched Mr Trudeau's end-of-summit press conference.
On his way to Singapore, the US president tweeted: "Based on Justin's false statements at his news conference, and the fact that Canada is charging massive Tariffs to our U.S. farmers, workers and companies, I have instructed our U.S. Reps not to endorse the Communique as we look at Tariffs on automobiles flooding the U.S. Market!
"PM Justin Trudeau of Canada acted so meek and mild during our @G7 meetings only to give a news conference after I left saying that, "US Tariffs were kind of insulting" and he "will not be pushed around." Very dishonest & weak. Our Tariffs are in response to his of 270% on dairy!"
At the summit, of which the build-up to had been dominated by Mr Trump's decision to slap tariffs on steel and aluminium imports, the world leaders had agreed a statement that read: "We acknowledge that free, fair and mutually beneficial trade and investment, while creating reciprocal benefits, are key engines for growth and job creation."
In response to Mr Trump's decision to withhold US support for the summit conclusions, a senior UK government source said: "We stand by the commitments made in the G7 communique."
Germany also said it will stand by the jointly agreed communique.
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Mr Trump had already threatened to divide the G7, made up of the US, France, UK, Italy, Germany, Japan and Canada, when he suggested Russia should be allowed to rejoin the group.
Russia was expelled following Vladimir Putin's annexation of Crimea in 2014, which Mr Trump characterised as "something happened a while ago".