KHARKIV, UKRAINE - APRIL 24: A police officer guards the door to a meeting of the Kharkiv regional administration's legislative session as people protest outside on April 24, 2014 in Kharkiv, Ukraine. The legislative body for the Kharkiv region was being urged by pro-Russian protesters outside to schedule a referendum on greater autonomy from the central government in Kiev. (Photo by Brendan Hoffman/Getty Images)