Russian state news says no Ukrainian troops in eastern Ukraine . Self - declared mayor of Slavyansk says diabetic hostage has the medicine he needs . Ukraine 's Security Service says OSCE mission is being held in ` ` inhumane conditions '' U.S. government says planned U.S. ' ` ` 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 . Ukraine 's Security Service says OSCE team is being held in `` inhumane conditions '' U.S. official says planned U.S. sanctions `` can have a significant impact '' on Russia .