HE is known as Russia's Osama bin Laden; Public Enemy No 1 for the Kremlin. Even the US has put a $5 million bounty on his head. Doku Umarov, 49, the Chechen warlord with the blackest of reputations, is assumed to be the mastermind behind a bombing campaign intended to disrupt Vladimir Putin's cherished dream of a successful Winter Olympics in Sochi. Certainly, he has set out his aims clearly enough. The Olympics, he said, were being held on "the bones of many, many dead Muslims buried on our land by the Black Sea".