Mikhail Khodorkovsky, a prominent critic of Russian president Vladimir Putin, may seek asylum in Britain following the declaration in Moscow that he has been arrested in absentia for possible involvement in a 1998 murder.

Russia wants to question former oil executive Mikhail Khodorkovsky as a suspect in a murder case that has been reopened because of new evidence, federal investigators announced.

Masked police have raided the Moscow offices of a civil society organisation funded by former oil tycoon Mikhail Khodorkovsky.