JOHANNESBURG — Prime Minister Mark Carney is in South Africa for a G20 summit overshadowed by a U.S. boycott — and as critics of Canada’s Africa strategy closely watch Carney’s first trip to the region as prime minister.

“There’s a great synergy and opportunity for us to collaborate on core challenges that affect us all,” said Carleton University professor David Hornsby, who specializes in South Africa and Canadian policies on Africa.

“The time is right for us to re-engage in significant ways.”

The Johannesburg gathering — the first G20 summit on the African continent — comes almost a year after the group officially admitted the African Union as a full member, similar to the European Union.

Canada has listed five priorities for the summit: improving critical mineral supply chains, usin

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