washington russian jet bomb target east euphrates river near dayr az zawr syria know us-backed syrian democratic force coalition advisers locate pentagon say saturday russian munition impact location know russians contain syrian democratic force coalition advisers pentagon say statement several sdf fighters wound add coalition troop advise assist sdf wound pentagon add sdf alliance kurdish arab militias fight u.s.-led coalition story correct spell dayr az zawr dayr az zawat first paragraph russia know u.s.-backed syrian force area bomb pentagon