Russia's most famous prisoner and Kremlin critic Mikhail Khodorkovsky has walked out of jail after spending more than 10 years behind bars, following a surprise pardon by President Vladimir Putin.
Putin pardoned Russia's former richest man on Friday, a day after stunning the country by saying the ex-tycoon had asked for clemency on humanitarian grounds as his mother was ill.
"Guided by humanitarian principles, I decree that Mikhail Borisovich Khodorkovsky ... should be pardoned and freed from any further punishment in the form of imprisonment," said the decree signed by Putin and published by the Kremlin.
Less than a half hour later, Khodorkovsky, 50, walked out of his prison colony in the town of Segezha in the Karelia region of northwestern Russia, the Interfax news agency reported, citing a local security source.
Khodorkovsky had been freed, a spokesman for the ex-tycoon confirmed.
"Yes, we confirm it," a spokesman for Khodorkovsky told AFP.
Khodorkovsky's lead lawyer, Vadim Klyuvgant, also told the Dozhd television channel that the defence had received confirmation from prison officials that the tycoon left his colony.
The Federal Service for the Execution of Punishment (FSIN) which runs Russia's prisons issued a statement confirming that Khodorkovsky's sentence had been terminated but not explicitly confirming he had walked free from the camp.
What role Khodorkovsky will play in Russia after his release is unclear, but it is appears certain that Putin would never had allowed his freedom if he was seen as a threat.
Khodorkovsky's 79-year-old mother Marina, who was caught off guard by Putin's announcement, said she was still trying to fathom what was happening.
"It has not sunk in yet," Marina Khodorkovskaya said in remarks broadcast on state television. Speaking in a shaky voice, she said she was taking sedatives to calm her nerves.
Khodorkovsky had been due to be released in August 2014 but Russian prosecutors earlier this month raised the threat of a third trial for the former tycoon on money-laundering charges.
Putin told reporters on Thursday that he saw no prospects for the third case.
The circumstances of the pardon also remained murky.
The former chief of the Yukos oil company had repeatedly said he would not ask Putin for a pardon because it would be tantamount to admitting guilt.
The Kommersant broadsheet, citing unnamed sources, said on Friday Khodorkovsky had decided to seek a pardon after a recent meeting with representatives of Russia's security services, who had raised the menace of a third trial against him.
Members of the security services met with Khodorkovsky told him the health of his cancer-stricken mother was worsening and warned him about a possible third criminal case against him.
Economists and political analysts put the release down to Kremlin's bid to improve its dismal rights record and international image ahead of the Winter Olympic Games that Russia is hosting in Sochi in February.
While Khodorkovsky's release was a watershed moment, it would not dramatically change Russia's battered investment climate or international image, they added.
The Eurasia Group consultancy said the former tycoon's release was a "charm offensive" ahead of the Sochi Olympics amid reports that heads of major states like Barack Obama of the United States and France's Francois Hollande will not be in attendance.
Supporters have said that Khodorkovsky had been thrown into jail and found guilty in two separate trials for daring to finance opposition to the Russian strongman.
He was snatched off his corporate plane in 2003 soon after Putin warned oligarchs against meddling in politics. He has been held in detention ever since.
