Insulting the host, alienating allies and threatening to suspend business with other countries: President Donald Trump was in full trade-warrior form for the weekend summit of the Group of Seven wealthy democracies in Canada.
Italian Prime Minister Giuseppe Conte echoed President Trump's calls for Russian Federation to be reinstated into the Group of Seven (G-7) on Friday, breaking with the European Union's stance on the issue.
"International cooperation can't depend on anger and small words".
"We have to keep a cool head now and draw the right conclusions", Maas said.
Trudeau, in Quebec City for bilateral meetings with non-G7 leaders after the summit, did not comment as he arrived.
At issue are US tariffs against Canada and Trudeau's effort to retaliate against its neighbor - as well as Trudeau's comment to reporters that all seven leaders had come together to sign a joint declaration after the G-7 meeting.
Canada's Prime Minister Justin Trudeau participates in the G-7 Working Session with Outreach Countries and International Organizations at the G-7 Summit in La Malbaie, Quebec on Saturday, June 9, 2018.
"We're like the piggy bank that everybody is robbing", Trump said.
It was part of a broader approach by foreign leaders to the second G7 meeting of Trump's presidency.
Trump has complained repeatedly - including throughout the summit - about Canada's protected dairy sector, citing 270 percent tariffs that he says stand in the way of American farmers accessing that market. We have seen this with the climate agreement or the Iran deal.
However, a subsequent tweet from Trump backed away from that notion and pointed to lingering divisions. The president had described the G7 meeting as cordial, even though he accused the USA allies of treating America "like a piggy bank".
Trump was reacting to comments made by Trudeau on Saturday in which he threatened to torpedo negotiations on a new NAFTA deal if the Americans did not remove tariffs on Canadian steel and aluminum. "It is in everyone's interest", he said on Twitter according to an English translation.
Trump's closest advisers added to the attack during televised interviews on Sunday.
Trade experts and officials are skeptical about Trump's idea of zero tariffs, as the Trump administration has slapped high tariffs on imports of solar panel, washing machines, steel and aluminum products.
A German government spokesman also said that Berlin stands by the jointly agreed G7 communique in which leaders underlined the crucial role of a rules-based global trading system and promised to fight protectionism.
South African President Cyril Ramaphosa, who met with Trudeau on Sunday, said it was time for G20 nations to play a role and to "also bring about some good sense to all the key players".