Pro-Russian protesters stormed the prosecutor’s office in the separatist-held city of Donetsk on Thursday, lobbing stones and smashing windows after accusing the office of working for the Western-backed government in Kiev. Donetsk, a city of about 1 million people in Ukraine’s industrial east, is at the center of an armed uprising across the steel and coal belt by mainly Russian-speakers threatening to secede from Ukraine. The violence, in a city already largely under the control of separatists, underscored the shifting security situation and suspicions in the region. More