On Monday, the Ukrainian film director and Russian political prisoner Oleg Sentsov entered the fourth week of his hunger strike. Sentsov, who is being held in the Polar Bear penal colony in the Yamalo-Nenets Autonomous District in the far north of Russia, more than 3,000 miles from his native Crimea, has refused food since May 14. He is demanding the release of 64 Ukrainian political prisoners held in Russian custody. (He is not demanding his own.) Last week the prison administration placed him under medical supervision.

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