The Man Putin Couldn't Kill

It was a story that shocked the world. In August 2020, Russia's opposition leader Aleksei Navalny was taken ill during a flight to Moscow. He was suspected of being poisoned with the banned chemical weapon Novichok, applied to his underwear. This remarkable documentary on BBC Select tries to unravel the bizarre case. Was Putin involved in the plot and if so, why did he want this man dead?