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Mikhail Khodorkovsky is a Russian businessman who was once the richest man in Russia. He made his fortune in the oil industry and was the head of Yukos, a major Russian oil company. Khodorkovsky was arrested in 2003 and charged with fraud and tax evasion. He was convicted and sentenced to 10 years in prison. He was released in 2013 and has since been living in exile in Switzerland.