Putin has been driven closer to China by a sharp decline in relations with the West after Moscow's 2014 annexation of Crimea and support for a separatist insurgency in eastern Ukraine.
Xi and Putin are "soulmates who want to make their countries great again", Alexander Gabuev, senior fellow at the Carnegie Moscow Center, told AFP.
Washington's trading partners are angry about US President Donald Trump's decision last week to impose tariffs on steel and aluminium imports from Canada, the European Union and Mexico.
In the week leading up to the G7 (Group of Seven) meeting, many were starting to call it the G6 +1, since Trump was doing everything in his power to alienate the other 6. You know, whether you like it or not, and it may not be politically correct, but we have a world to run. However, for USA national security what will be even more important is a Trump summit with Russian President Vladimir Putin.
The group managed a common statement in which they agreed to disagree on some issues, only to have Trump disavow the document in a tweet after leaving the meeting.
Trump contends that other countries "have been taking advantage of the United States on trade".
As tempers frayed, Trump had a ready retort, via tweet: "Please tell Prime Minister Trudeau and President Macron that they are charging the USA massive tariffs and create non-monetary barriers".
Mr Trump's strained relationship with the rest of the G7 was in evidence on Saturday when he arrived late for the opening session, with Mr Trudeau addressing a gathering that included an empty chair where the president was meant to be. She said the two leaders exchanged pleasantries and briefly discussed trade.
Mr Putin said that some nations, including Austria, have offered to host his summit with Mr Trump.
Deontay Wilder agrees to fight Anthony Joshua in world heavyweight unification fight
The offer also includes a rematch clause, which Joshua and his team insisted on, and Wilder is happy to accept that also. Wilder, 32, accepted the terms offered by Joshua's promoters, Matchroom Sport, late on Monday evening.
Mr Macron - who has cultivated a close relationship with Mr Trump over recent months - stressed that the U.S. was isolated.
Chinese leader Xi Jinping called for the Iran nuclear deal to be "earnestly" implemented as he met the country's president following the U.S. withdrawal from the pact, state media said Monday.
President Donald Trump headed into the Group of Seven summit in Canada at odds with allies over US trade penalties. "We have opened both our country and our hearts to the world".
Speaking to reporters before boarding his helicopter, Trump became extremely animated on the subject of Russian Federation. "It will start first of all to hurt USA workers".
The premier, however, said that Britain had registered its "deep disappointment at the unjustified decision by the U.S.to apply tariffs to European Union steel and aluminum imports" at the meeting.
"We are ready to boost, deepen and improve relations with the United States".
In his remarks to reporters on the White House lawn before departing for Canada Friday morning, Trump touched on a wide range of topics.
But the Prime Minister twice refused to say whether she had requested a formal bilateral meeting with Mr Trump. He may be right about Russian Federation, but why not China? Ali was convicted in 1967 of avoiding military service. "Those nations that share our values and have sacrificed alongside us for decades are being treated with contempt". Noting Ali's conviction had been overturned, Tweel said "there is no conviction from which a pardon is needed".
Trump is in Singapore for his historic meeting with North Korean President Kim Jong Un.