An armed pro-Russian separatist sits outside the regional administration building in the east Ukrainian city of Donetsk May 29, 2014. Pro-Russian separatists shot down a Ukrainian army helicopter on Thursday, killing 14 soldiers including a general, as government forces pressed ahead with an offensive to crush rebellions in the east swiftly following the election of a new president. REUTERS/Maxim Zmeyev (UKRAINE - Tags: POLITICS CIVIL UNREST)