The president has been a disruptive force for the global trading order, insisting other countries move to reduce barriers he said have left the US with a trade deficit of more than $800 billion.
"They do so much more business with us than we do with them that we can't lose ..."
President Donald Trump departed the Group of Seven summit early Saturday without making any trade concessions and declared the leaders of the industrialized countries have treated the United States as "piggy bank" to be robbed.
"We have a very really good relationship, very special" - Trump insists he's still best buddies with Emmanuel Macron after his latest no-holds barred handshake with the Frenchman.
"Russia is focused on other formats, apart from the G7", Kremlin spokesman Dmitry Peskov said in a statement reported by the government-controlled Sputnik news agency. The diplomatic Canadian was heard saying 'good to see you guys.
"The nature of the debate we had was rather appeasement and it stopped the escalation in terms of behaviour", Macron, who had exchanged terse Twitter messages with Trump in the run-up to the summit, told reporters.
Trump had already said he would not hesitate to shut countries out of the United States market if they retaliate to his tariffs.
But during his comments on Saturday morning, Trump said there were still a number of different ways the NAFTA talks could play out, including the possibility of doing separate deals with Mexico and Canada, effectively cleaving the 20-year agreement in two.
The US president did not appear to be listening during some of the trade presentations, another G7 official familiar with the meeting said. "Only to give a news conference after I left saying that "us tariffs were kind of insulting" and "he will not be pushed around".
Trump often appeared more interested in the unprecedented summit he will hold Tuesday with North Korean leader Kim Jong Un, where he said he looks forward to sizing up both Kim and the potential for ending one of the world's most risky nuclear standoffs. Instead, he blamed trade deficits on his predecessors.
British Prime Minister Theresa May said the other G7 leaders registered their "deep disappointment at the unjustified decision by the U.S." on its closest allies.
"We have done just that at this summit, registering our deep disappointment at the unjustified decision by the USA to apply tariffs to European Union steel and aluminium imports".
"For us, it was important to have a commitment to rules-based trade", Germany's Chancellor Angela Merkel said. "Canadians are polite and reasonable but we will also not be pushed around".
Other high non-tariff barriers harm US wheat and barley growers.
A member of Macron's team characterised the talks as "frank and robust", with Trump first repeating his lengthy diatribe about what he regards as unfair trade restrictions - before the Europeans responded with facts and figures they felt would blunt his argument.
Readmitting Russia to the group would be an "asset", according to the president.
He added that President Trump, in his efforts to bring about balanced trade with global partners, "reserves the right to defend those industries critical to our own national security. The President of the United States thinks that the U.S. has been treated in an unfair way by Europe and by others, and the others think that this is not the case", European Commission President Jean-Claude Juncker told a press conference in La Malbaie.