At the same time the U.S. says it is open to the Russian idea, Kerry and other officials want to see the details and want to see them fast. "It cannot be a delay tactic," Kerry told members of House panel.
"I have in several conversations with Foreign Minister Lavrov, that this cannot be a process of delay, this cannot be a process of avoidance, that is has to be real, it has to be measurable, tangible," Kerry said. "And it is exceedingly difficult — I want everybody here to know — to fulfill those conditions. But we're waiting for that proposal, but we're not waiting for long."
Associated Press Diplomatic Writer Matthew Lee contributed to this report.
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