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
* Putin's Russia: from KGB agent to Kremlin operator – video
* Putin's Russia: dictator syndrome and the rise of a 'mafia state' – video
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