The White House says an Iranian proposal addressing its nuclear program is useful and contains a "level of seriousness and substance that we have not seen before."
White House spokesman Jay Carney says not to expect a prompt breakthrough in the high-level nuclear talks between Iran and six world powers.
Still, the talks ended on a positive note Wednesday. The European Union's top diplomat called them "very important."
A new meeting among the parties is scheduled for Nov. 7-8 in Geneva.
Carney says: "We found the Iranian presentation very useful."
He added that the deal must prove to the international community that Iran's nuclear program is exclusively for peaceful purposes.
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