The G20's role in fixing economic crises is threatened by geopolitical fractures and competition, 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 -- also scrambled on the sidelines to respond to a unilateral plan pushed by US President Donald Trump to end the war in Ukraine on terms favouring Russia.

"We are struggling to resolve major crises together around this table" and "the G20 may be coming to the end of a cycle," French President Emmanuel Macron warned fellow leaders at the start of the summit.

"There's no doubt, the road ahead is tough," agreed British Prime Minister Keir Starmer, adding: "We need to find ways to play a constructive role again today in the face of the world

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