Poroshenko says Russia needs to help bring peace to eastern Ukraine . U.S. President Barack Obama congratulated Ukrainians for casting their ballots Sunday and criticized Russia-backed separatists , whom he accused of trying to block voting . Russian FM Lavrov says Russia respects choice but has some concerns about vote . Comment:
Poroshenko says Russia needs to help bring peace to eastern Ukraine . Russian FM Lavrov says Russia respects choice but has some concerns about vote . Comment: