The G20's role in fixing economic crises is threatened by geopolitical fractures, leaders warned Saturday at a summit in South Africa boycotted by the United States.

European leaders attending the G20 summit -- the first held in Africa -- huddled on its sidelines to push back at a unilateral plan by US President Donald Trump aimed at ending the war in Ukraine on terms favouring Russia.

In a joint statement issued with Canada and Japan, they said Trump's plan needs "additional work" as it would leave Ukraine "vulnerable". They added that some of its points required "the consent of EU and NATO members".

Speaking at the opening of the summit, one of the statement's signatories, French President Emmanuel Macron, said: "We are struggling to resolve major crises together around this table."

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