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Vladimir Putin: The brutal methods behind his rise to power

Former Russian spy Alexander Litvinenko was poisoned and killed in November 2006.

The 43-year-old had been an officer with the Federal Security Service (FSB), the successor to the KGB, but he fled to Britain, where he became a fierce critic of the Kremlin. 'The New Tsar' unveils what Vladimir Putin said in private about the poisoning and explores the often brutal methods behind his extraordinary rise to power.

Watch the full documentary on BBC Select.