A Russian court has sentenced the opposition politician Ilya Yashin to eight and a half years in prison, in the most high-profile case to date of a Russian dissident being jailed for opposing the invasion of Ukraine. Yashin was tried on charges of spreading false information meant to discredit the Russian army, under a law introduced after Russia launched its invasion, due to a series of posts in May about the murder and torture of Ukrainian civilians by Russian troops in the town of Bucha. “Expressing hatred of the political system of the Russian Federation and realising that he is...