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World leaders posed for a photo at the G20 summit in Argentina, which began today, but huge differences loom on climate change, trade, and the killing of the Saudi journalist Jamal Khashoggi.

Also in the programme: Ukraine has announced a ban on Russian men aged 16-60 entering the country; and we'll hear how Namibia has seen a 50% reduction in HIV infections in the past two years.

(Photo: Leaders of the G20 pose for the official picture at the summit in Buenos Aires, Argentina. Credit: EPA)