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A boy looks on during the funeral of a man who was killed during last month's clashes with riot police on Kiev's Independence square on March 1, 2014. Pro-Russian forces tightened their grip on Crimea on Saturday as the Kremlin vowed to help restore calm on the restive Ukrainian peninsula and Washington warned of "costs" to Moscow should it order in troops.

People sing the Ukrainian national anthem during the funerals of a man killed in last month's clashes with riot police in Kiev.BULENT KILIC / AFP - Getty Images