NEW : U.S. spokeswoman : Separatist leader in Donetsk does n't represent region . Ukraine 's border service says armed men killed a detained separatist leader . Luhansk 's ` ` region 's governor '' Valeriy Bolotov was wanted by the security services . Luhansk 's self-declared `` people 's governor '' Elections were high in eastern Ukraine , with presidential elections just over a month away .
NEW : U.S. spokeswoman : Separatist leader in Donetsk does n't represent region . Ukraine 's border service says armed men killed a detained separatist leader . Luhansk 's ` ` region 's governor '' Valeriy Bolotov was wanted by the security services . Elections were high in eastern Ukraine , with presidential elections just over a month away .