` We urge Russia to leave us alone , '' he said in televised remarks . Russian state news says 15,000 Ukrainian troops in eastern Ukraine . Self-declared mayor of Slavyansk says diabetic hostage has the medicine he needs . The Associated Press reports that a group calling itself the Donetsk People's Republic said it had seized control over several government buildings and was holding about 100 people hostage. U.S. official says planned U.S. sanctions `` can have a significant impact '' on Russia .
Russian state news says 15,000 Ukrainian troops in eastern Ukraine . Self-declared mayor of Slavyansk says diabetic hostage has the medicine he needs . The Associated Press reports that a group calling itself the Donetsk People's Republic said it had seized control over several government buildings and was holding about 100 people hostage. U.S. official says planned U.S. sanctions `` can have a significant impact '' on Russia .