Vladimir Putin rules Russia with ruthless efficiency. Opponents and potential rivals know they are engaged in a dangerous game. For proof they need look no further than the fate of Mikhail Khodorkovsky, once Russia's richest man, an oligarch who crossed the Kremlin, and who has been a prisoner for the past decade. HARDtalk speaks to his son, Pavel Khodorkovsky. His father is due to be freed next year, but can Vladimir Putin afford to let him go? Show less