Christo Grozev once humorously described himself as an ‘internet nerd’ who hunted Russian trolls in his spare time. Well, his hobby has now made him an internationally celebrated journalist - and earned him a place on Russia’s most wanted list. As Lead Russia Investigator for the open-source investigative website Bellingcat, Grozev is one of the best people to talk to if you want to learn more about the war of information being fought by Moscow, and how data trails from some of the GRU’s more clumsy spies are giving canny investigators and journalists the chance to expose some of Russia’s activities it would rather you not know about. Sir Richard Dearlove and Julia Macfarlane sit down with him to find out more.