Russian ex-tycoon Mikhail Khodorkovsky has arrived in Germany, hours after being pardoned by President Vladimir Putin, German officials say. Russian prison officials said Mr Khodorkovsky had requested travel papers to see his sick mother there. Mr Khodorkovsky's father told AP he and his wife were still in Moscow but were planning to fly to Germany, where she has been treated in the past. Mr Putin earlier said he had signed the pardon on "the principles of humanity". Mr Khodorkovsky, 50, had been in custody for a decade. The former head of the now defunct oil giant Yukos, who was once Russia's richest man had been jailed for tax evasion and theft after funding opposition parties.