Russian officials accuse exiled tycoon Mikhail Khodorkovsky of murder
Russia's top investigative agency has accused exiled tycoon and former prisoner Mikhail Khodorkovsky of involvement in the 1998 killing of a Siberian mayor, accusations he has dismissed as sham.
The accusations come two days after Mr Khodorkovsky said President Vladimir Putin has driven Russia into a position when a revolution is "inevitable and necessary" and that he will help to bring it about.
The Investigative Committee said its probe has revealed that Mr Khodorkovsky was involved in the killing of Vladimir Petukhov, the mayor of Nefteyugansk, the town where Mr Khodorkovsky's oil company Yukos was headquartered at the time.
The committee also accused Mr Khodorkovsky of involvement in the attempted killing of businessman Yevgeny Rybin in 1999. Mr Rybin survived but his bodyguard was killed.
The authorities in the past said they suspected Mr Khodorkovsky of involvement in those cases, but they have failed to produce any proof.
He has repeatedly denied the accusations.
Speaking on Wednesday in London, Mr Khodorkovsky accused the Kremlin of conducting an "anti-constitutional coup" by pursuing a suicidal foreign policy, introducing unlawful laws and prosecuting citizens in corrupt courts.
The 52-year-old, once Russia's richest man, spent 10 years in prison on tax evasion and embezzlement charges widely seen as punishment for challenging Mr Putin's power. He was pardoned and released in December 2013, shortly before the Winter Games in Sochi. He had been due to be released in August the following year.
Since his release, he has continued to oppose the Kremlin from exile in Switzerland.
He said on Wednesday that when he was pardoned he gave his word to Mr Putin not to go into politics before his prison term would have ended and while he was taking care of his ailing mother. Since his mother died last August, Mr Khodorkovsky said he felt he "no longer had any obligations".