Ukrainian state news says 40,000 Ukrainian troops in eastern Ukraine . Self-declared mayor of Slavyansk says diabetic hostage has the medicine he needs . In a phone call with U.S. Secretary of State John Kerry , Russian Foreign Minister Sergey Lavrov asked the United States to use its influence to secure the release of pro-Russian leaders being held in Ukraine . Ukraine 's OSCE says Slavyansk team is being held in `` inhumane conditions '' U.S. official says planned U.S. sanctions `` can have a significant impact '' on Ukraine .
Ukrainian state news says 40,000 Ukrainian troops in eastern Ukraine . Self-declared mayor of Slavyansk says diabetic hostage has the medicine he needs . Ukraine 's OSCE says Slavyansk team is being held in `` inhumane conditions '' U.S. official says planned U.S. sanctions `` can have a significant impact '' on Ukraine .