Mikhail Khodorkovsky, once his country’s richest man, has resided in “gulag lite,” as he calls the Russian penal system under Vladimir Putin, for six years. Since the spring, on most working days he is roused at 6:45 in the morning, surrounded by guards and packed into an armored van for the drive to court. For two hours each way, the man who once supplied 2 percent of the world’s oil crouches in a steel cage measuring 47 by 31 by 20 inches. Convicted of tax evasion and fraud in 2005, Khodorkovsky now faces a fresh set of charges that add up to the supposed theft of $30 billion. In the dark of the van, Khodorkovsky tries to prepare for his trial,