He also said the G7 countries had "again" failed to provide any evidence that Russian Federation was behind the poisoning of a former double agent and his daughter in Britain in March. "There will be no world hegemony if we know how to organize ourselves".
Although Trump says his tariffs are necessary to protect USA industry and workers, Canada and the European Union have denounced them as illegal.
With the USA the odd man out, there were serious doubts that a typical G-7 "communique" - a joint statement from the participants describing the progress achieved during the summit - could be issued.
Let's set the context here. The member countries are Canada, France, Italy, Japan, Germany, the United States and Britain.
British Prime Minister Theresa May on Friday warned both Trump and the European Union of the dangers of entering a tit-for-tat trade war over tariffs, urging both sides to instead focus on China's excess steel production.
"Some people like the idea of bringing Russian Federation back in".
Putin responded: 'It wasn't us who left.
Putin said that during his last telephone conversation with the US president, Trump "expressed his concern about the threat of a new round of the arms race".
Love you man
Trump and Putin are in an opposite situation.
Speaking to reporters before boarding his helicopter, Trump became extremely animated on the subject of Russian Federation.
Taking to the USA president's favourite social media, Twitter, Mr Conte wrote: "I agree with President Trump: Russia should return to the G8". It's a chance for a group of allies to gather together and discuss their common interests and how they might act together to pursue them. Either we're the victor or the loser, and if it's not obvious that we're the victor then we must be the loser, the chump, the sap, the sucker.
While the G7 chiefs have largely praised Trump for his efforts to stabilise the Korean peninsula, they are unhappy he pulled out of an worldwide agreement created to limit Iran's nuclear ambitions. The president, who has railed over trade deficits with other countries, views his protectionist trade moves as key to his base and has grown increasingly frustrated with the leaders over their critiques. Just last week he met the heads of states representing over half of the planet's population.
"In the future we'll be talking about future trade relations, but of course the security relationship that underpins the UK's long-standing special relationship with the United States is of particular importance to us".
"Looking forward to straightening out unfair Trade Deals with the G-7 countries".
The US leader fired off a series of messages on Twitter hitting out at his counterparts before the summit even opened.
Taking stock of the on-going turmoil in war-ridden Afghanistan, Putin said, "It is crucial that we fight the terrorist threat emanating from that country in unison, curb drug production and trafficking and render aid to Afghanistan in its national reconciliation, economic revival and stabilisation".
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