18:00Six O'Clock News04/08/2023 Putin critic Alexei Navalny has jail sentence extendedBBC Radio 4 Duration: 30 minutes Fri 4th Aug 2023, 18:00 on BBC Radio 4 FMAvailable for over a yearListen nowThe prominent Russian opposition leader has been sentenced for a further 19 yearsGenresNewsBrandSix O'Clock News Source: BBC Online