GENEVA - Syria's government delegation has been "stonewalling every step of the way" in Geneva peace talks and Washington expects Russia to pressure them to engage seriously in the peace process, a senior US official said on Friday.

"We hope and trust that because the Russians believe in a political solution, a diplomatic solution, they will urge the regime to engage in a serious and constructive way," the official said. "The regime hasn't done so yet, that speaks for itself."

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