With his focus on stamping out endemic corruption and his canny ability to bypass state media channels, the Russian opposition leader Alexei Navalny is a thorn in the side of President Vladimir Putin. Navalny may now be in jail, but his support base is wide and repeated attempts to silence him increasingly seem to have the opposite effect. Guardian journalist and former Moscow correspondent Luke Harding shares his Perspective on why the opposition figure is a force to be reckoned with.
