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How far can Vladimir Putin push his iron-fist foreign policy? Crimea is his, but Russia's next move in eastern Ukraine is much less clear cut, as is the extent of the Kremlin's neo-imperialist ambition. HARDtalk speaks to Sergey Karaganov - one of Russia's most influential foreign policy thinkers and until recently, an advisor to President Putin. Is restoring Russian greatness a coherent strategy?