A boy with a toy gun poses for a picture in front of barricades at the police headquarters in the eastern Ukrainian town of Slaviansk, April 17, 2014. Russian President Vladimir Putin said on Thursday that Ukraine's government needs to provide guarantees to its Russian-speaking population in the east of the country to resolve the crisis. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)