Russian former oil tycoon Mikhail Khodorkovsky speaks at a conference called Ukraine-Russia Dialogue in Kiev, Ukraine, Thursday, April 24, 2014. Russia’s most famous prisoner, the former oil tycoon

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Russian former oil tycoon Mikhail Khodorkovsky speaks at a conference called Ukraine-Russia Dialogue in Kiev, Ukraine, Thursday, April 24, 2014. Russia’s most famous prisoner, the former oil tycoon Mikhail Khodorkovsky, has harshly criticized Russian president Vladimir Putin, saying he was pressuring Ukraine out of petty vengeance. Khodorkovsky, who spent 10 years in prison, spoke at the opening of a conference in Kiev devoted to fostering ties between Ukraine and Russia, despite Russia’s annexation of Crimea.(AP Photo/Sergei Chuzavkov)

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Associated Press
Fri, Apr 25, 2014 10:47 PM EDT