Divisions between Donald Trump and other leaders of G7 nations were laid bare on the first day of their summit.
The US leader made a surprise call for Russia to be readmitted to the group of top industrialised nations after its expulsion for annexing Crimea.
But German Chancellor Angela Merkel said EU members attending the summit in Canada were all against the idea.
Frictions over trade tariffs recently imposed by the Trump administration continued during Friday’s session.
After meeting French President Emmanuel Macron, Mr Trump said they had a little test once in a while when it came to trade but, he added, they were working it out.
For his part, Mr Macron said he believed all sides were willing to find an agreement.
Reuters news agency cited a French presidential aide as saying the US had agreed to start a trade dialogue with the EU at a technical level in the next two weeks.
Mr Trump is leaving the two-day summit early to head to Singapore for his landmark summit with North Korean leader Kim Jong-un.
Canada had called Mr Trump’s trade tariffs “illegal” while European Council President Donald Tusk warned that Mr Trump’s stance on trade, climate change and Iran constituted a real danger.
“What worries me most, however, is the fact that the rules-based international order is being challenged, quite surprisingly not by the usual suspects but by its main architect and guarantor: the US,” he said.
What is the G7?
It is an annual summit bringing together Canada, the US, the UK, France, Italy, Japan and Germany, which represent more than 60% of global net worth between them.
Economics tops the agenda, although the meetings now always branch off to cover major global issues.
This time they are meeting in the town of La Malbaie in Quebec.
Mr Trump said: “You know, whether you like it or not – and it may not be politically correct – but we have a world to run and in the G7, which used to be the G8, they threw Russia out. They should let Russia come back in.”