The US president had earlier called for Russian Federation - which was suspended from the group in 2014, following Moscow's annexation of Crimea, and chose to leave permanently in 2017 - to be readmitted in the interests of realpolitik.
That said, dictatorships such as Saudi Arabia have succeeded in flattering Trump and getting something in return - largely because they can offer him material rewards in addition to kind words.
But before leaving Washington, he made clear that he too has no intention of backing down on his plan to rebalance trade by imposing tariffs on steel, aluminum and other goods imported from United States allies.
There's this meeting coming up in Singapore that Trump is much more interested in making than hanging around Quebec listening to 6 allies chew his ear off for going it alone on trade and climate change.
In the United States, Trump's comments drew criticism from some fellow Republicans, including Senator John McCain, who slammed Trump for treating Putin with "the deference and esteem that should be reserved for our closest allies".
In the last week, Trump and Trudeau have exchanged tough words over trade after the US imposed hefty tariffs on steel and aluminum from Canada, Mexico and Europe. He did not elaborate.
After rumours there would be no joint closing statement because of the divisions, President Trump told reporters he believed there would be one after all.
French President Emmanuel Macron, who was fiercely critical of Trump as recently as Thursday in Ottawa, posted a video of his meeting with the president on Friday that contained a caption out of a Hallmark greeting card.
The G7 - or group of seven - comprises the largest advanced economies in the world: the UK, US, Canada, France, Germany, Japan and Italy.
Economics tops the agenda, although the meetings now always branch off to cover major global issues.
This marks Trump's second summit of the G-7, an informal gathering that meets every year under a rotating chairmanship. The U.S. president has recently whacked all the other members of the G7 with hefty steel and aluminum tariffs and is threatening to also impose tariffs on vehicle imports, which would also hit them hard. Canada too says it remains opposed.
"Russia is focused on other formats apart from the G-7", Peskov said, according to the Sputnik news agency. Vladimir Putin was kicked out in 2014 for annexing Crimea. "If it doesn't happen, we come out even better!" the president wrote on Twitter, hours before he's due to arrive in Quebec.
Trudeau has called Trump's imposition of the tariffs "irresponsible" and "insulting" because the two countries have fought as allies in Second World War, Korea and Afghanistan.
"Looking forward to straightening out unfair Trade Deals with the G-7 countries. And we've made a lot of progress today".
The US president signaled that he was in no mood to compromise as he met Japanese Prime Minister Shinzo Abe.
"We will also obviously have some very robust discussions on trade", Trudeau said.
The US president was very much the odd man out on climate change during the G7 in Italy previous year, later announcing his intention to withdraw from the landmark Paris agreement.
German Chancellor Angela Merkel responded positively to Trump's suggestion Friday, telling him: "We'll take it as a starting point". This angered the other signatories who have since sought to shore it up.