The former oil baron Mikhail Khodorkovsky was reunited with his family in Berlin on Saturday, a day after being released from a decade-long imprisonment in Russia. Khodorkovsky, a prominent critic of Russian President Vladimir Putin, was meeting with his eldest son Pavel and his parents, Marina and Boris, who had flown separately to the German capital to meet him, said Christian Hanne, Khodorkovsky's spokesman. "Today is family day," Hanne told The Associated Press . Once Russia's richest man, the billionaire boss of the country's largest oil company, Yukos, was arrested in 2003 and charged with tax evasion, though many thought he was being punished for challenging Putin. His current net worth is unknown.