Russia's former oil tycoon Mikhail Khodorkovsky said Sunday after walking free from a decade in jail that he would stay away from his homeland but help to free Russian political prisoners still behind bars.

In an astonishing turn of events, the Kremlin critic surfaced in Germany hours after his release on Friday from a prison in an obscure corner of northern Russia, following a pardon by President Vladimir Putin.

Mobbed by reporters at his first news conference in Berlin barely two days since leaving jail, Khodorkovsky admitted he had been given no choice over his final destination and thanked German Chancellor Angela Merkel for aiding his liberation.

Khodorkovsky, formerly Russia's richest man, said he had no intention of becoming involved in Russian politics and could not return to the country so long as a court order for him to pay $550 million in damages was still in place.

"A fight for power is not for me," said Khodorkovsky, wearing a sharp business suit but almost shaven-headed, at the news conference held in the Berlin Wall museum at the symbolic Cold War location of Checkpoint Charlie.

He said he would focus his energies on helping political prisoners walk out of Russian jails. "I will do everything so that there are none left, do everything I can."

He added that Western governments should "remember I am not the last political prisoner in Russia," adding it would be wrong if he was seen as a "symbol" that there were no longer political prisoners in his country.

Rights groups are still seeking to secure the release of around a dozen protesters arrested for their role in a 2012 rally on the eve of Putin's inauguration for a third term, who many see as political prisoners.

Khodorkovsky's co-accused, business partner and friend Platon Lebedev also remains incarcerated.

He said he could only return to Russia if the Supreme Court lifted the lawsuit claiming the $550 million in damages. The existence of the claim meant that if he ever returned there was no "guarantee" he would ever be allowed to leave Russia.

'No choice' over move to Germany

The former chief executive and founder of the Yukos oil giant said he had no plans to go back into business but had enough means to live on.

Striking a conciliatory note, Khodorkovsky also said he had no intention of seeking the return of Yukos assets which were seized by the Russian state and bought by state oil firm Rosneft in shady auctions.

He thanked Merkel for working on his release, saying that he had been granted a German visa for one year.

"She (Merkel) made it possible for me to be free today," he said as well as thanking former German foreign minister Hans-Dietrich Genscher who held secret talks with Putin to win his freedom.

But he said had had "no choice" over his final destination after his release, which began on Friday morning when he was awoken at 2:00 am by the head of his prison colony in Segezha in Karelia.

He said it was only clear he was heading to Germany when the doors closed of the private jet laid on by Genscher which took him out of Russia.

"Many facts of my release are still unknown to me," said Khodorkovsky.

Asked about his relationship with Putin, Khodorkovsky refused to be drawn into expressing hatred towards the Russian strongman who the former tycoon's supporters accuse of ordering his two trials and convictions to eliminate a potentially dangerous opponent.

At the time of his arrest in 2003, Khodorkovsky was openly critical of Putin and had begun financing the Russian opposition.

But he said that while he had been treated harshly, "my family had never been touched" and as a result he was able to view relations with Putin with "pragmatism which does not foresee such unpragmatic things like revenge, hatred and so on."

Khodorkovsky said he was against a boycott of the Sochi Olympics in February 2014, noting a "festival of sport should not be spoilt". But he acknowledged it should not become a "festival of Vladimir Putin".

'A film could not have done it better'

Widely seen as Russia's most famous post-Soviet inmate, Khodorkovsky was jailed for financial crimes in separate convictions in 2005 and 2010. He had been due for release in August 2014.

He acknowledged his lighting-quick exit was stage-managed. "If someone wanted to make a movie about the 1970s and the deportation of a dissident you could not have done it better," he told the New Times weekly.

On Saturday, the 50-year-old was reunited with his parents, 79-year-old mother Marina and 80-year-old father Boris, who travelled to Berlin from Moscow, and with his eldest son Pavel, who lives in the United States.

Khodorkovsky's release came amid intense activity in Russia in an apparent bid to improve its image ahead of the Olympics and its chairmanship of the G8 next year, with parliament also approving a major amnesty.

Two jailed members of the Pussy Riot punk band are expected to be freed under the amnesty that comes less than two months before the Olympic Games open in Sochi.

Thirty Greenpeace activists, arrested on hooliganism charges after a protest against Arctic oil drilling, are also expected to escape prosecution.

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