Navalny: Concern grows over health of Putin critic

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As the US warns Russia of 'consequences' if opposition leader Alexei Navalny dies in prison, we speak to his chief of staff for an update on his health. As the trial of former Minneapolis policeman Derek Chauvin draws to a close, we look back at the impact of the death of George Floyd. And very shortly, Nasa will attempt to fly a helicopter over the surface of Mars. The craft - called Ingenuity- could transform the way we explore distant planets.