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The Chinese president, Xi Jinping, is about to hold talks with his Russian counterpart, Vladimir Putin, hours ahead of the start of the Beijing Winter Olympics. It will be Mr Xi's first face-to-face meeting with a world leader since the start of the pandemic two years ago. The meeting comes amid the ongoing Russia-Ukraine crisis.

South African scientists have made a copy of the Moderna coronavirus vaccine in what's being seen as a breakthrough for poorer countries. We'll speak to the chief scientist in the project.

And the British prime minister, Boris Johnson, is under further pressure following the resignation of four of his most senior aides. They include his chief of staff, head of communications and head of policy.