President Biden has blamed the death on Vladimir Putin. Mr Navalny's wife said Mr Putin would be held responsible. Despite official warnings against protests, hundreds of people have been leaving flowers in central Moscow and other Russian cities in memory of Mr Navalny.

Also on the programme; Donald Trump has been ordered to pay more than three hundred and fifty million dollars in penalties in his civil fraud trial in New York. And most of the world's biggest tech companies - including Amazon, Google and Microsoft - have agreed to tackle what they are calling the use of deceptive artificial intelligence in elections.

(Picture: Tributes to Alexei Navalny. Credit: EPA)