Khodorkovsky vows to help Russian political prisoners
22 December 2013 Last updated at 13:54 GMT
Former Russian oil tycoon Mikhail Khodorkovsky has vowed to help other political prisoners following his release from jail.
At a news conference in Berlin, he thanked his supporters and German Chancellor Angela Merkel for helping to secure his release.
He said he only found out he was being sent to Berlin on the day he was freed.
Khodorkovsky was released on Friday, after spending 10 years in a Russian prison for fraud and tax evasion.
Daniel Sandford reports from Berlin.