Why is Vladimir Putin so obsessed with Ukraine?

Guardian correspondent Luke Harding chronicles the key historical events that led to the invasion of Ukraine, from the Euromaidan protests to the annexation of Crimea, and explains why Putin’s belief that Russians and Ukrainians are ’one people’ is rooted in history from a thousand years ago. Subscribe to The Guardian on YouTube ► Putin’s Russia: from KGB agent to Kremlin operator – video Putin’s Russia: dictator syndrome and the rise of a ’mafia state’ – video The Guardian publishes independent journalism, made possible by supporters. Contribute to The Guardian today ► Sign up to the Guardian’s free new daily newsletter, First Edition ► http://theguardian.c