European Council President Donald Tusk, Britain's Prime Minister Theresa May, Germany's Chancellor Angela Merkel, US President Donald Trump, and Canada's Prime Minister Justin Trudeau pose during a family photo at the G7 Summit in the Charlevoix city of La Malbaie, Quebec, Canada, June 8, 2018.
Singling out U.S. president Trump, the group says they have no faith in him to "defend women, the environment and immigrants".
"We're going to deal with the unfair trade practices".
The summit - its main themes this year being women's empowerment and climate change - brought U.S. President Donald Trump to Canada for the first time.
Trump showed no sign of backing down on Friday, after earlier accusing both France and Canada of imposing massive tariffs on US goods and then accusing Canadian Prime Minister Justin Trudeau of "being so indignant". Trump tweeted early Friday morning ahead of his planned departure from Washington to Quebec.
"Africa is going to have the largest population base of any continent in 25 years, and I really do believe that helping Africa through what is a very hard period now will benefit the world enormously and this is a role that the G7 and G20 must play". "The aim of this should be to restore collaborative partnerships to promote free, fair, predictable and mutually beneficial trade", the statement said.
Officials have conceded the mood at the summit will likely be exceptionally tense.
"You're going to have the majority of the G7 countries wanting to deal with this, as was the case with the finance ministers when they met in Whistler (a resort municipality in the Canadian province of British Columbia)", said Paul Martin, who is also a former Canadian finance minister, in an interview.
Canada and Mexico, the other members of NAFTA, have been frustrated by what they see as unacceptable USA demands in slow-moving talks to modernize the deal.
French President Emmanuel Macron warned Trump in a rare rebuke on Thursday that the other six members of the G7 might form their own group, adding that no leader "is forever". Among his shots is criticism of Canada for unfairly charging tariffs on dairy products shipped to the US.
The White House subsequently announced the president would be leaving on Saturday, before the summit formally ends, to fly to Singapore for a meeting with North Korean leader Kim Jong Un.