Mr Razvozzhayev said he was abducted in Ukraine, smuggled into Russia and forced into signing a confession, which he later disavowed.

BBC: Russia activist Sergei Udaltsov under house arrest

He later said he had been forced into making the confession.

BBC: Kazakhstan military plane crash kills 27 near Shymkent

She claimed her husband and his family forced her to make the confession and that he was the killer.

BBC: Sara Ege: Life jail for son's murder over Koran studies

Bolshoi theatre staff - including dancers as well as choir, orchestra and stage members - said Mr Dmitrichenko's confession had seemed forced.

BBC: Bolshoi cast defend dancer arrested over acid attack