[JURIST] Jailed Russian oil tycoon Mikhail Khodorkovsky [JURIST news archive; defense website] has ended his four-day hunger strike [JURIST report], his lawyer announced Friday. Khodorkovsky began the protest after his business partner and co-defendant Platon Lebedev was placed in solitary confinement for refusing to take a required daily walk, though Russian prison officials denied reports [JURIST report] of the hunger strike. Lebedev has been transferred out of the punishment cell [MosNews report], prompting Khodorkovsky to end the hunger strike. Khodorkovsky and Lebedev are each serving nine-year prison sentences [JURIST report] for fraud and tax evasion. AP has more.