"We remain committed to the Geneva process, we believe that the future of Syria will not include Bashar al Assad, but that is ultimately up to the Syrian people", Nauert said.
De Mistura expressed disappointment with the opposition's insistence on ruling out a role for Assad but said 11 meetings with opposition negotiators in the course of two weeks had constructively explored approaches to holding elections and drafting a new constitution.
"I don't see why he shouldn't or wouldn't run for another presidential term", Alexander Lavrentiev, appointed by the Kremlin to steer the Syria peace process, said in an interview Monday in Ankara, Turkey.
Noting the regime delegation's preconditions to have direct talks with the opposition, de Mistura said: "l did not see that the government was really looking to find a way to have dialogue in a negotiation during this round. l have to say regrettably. l did see that the opposition were trying to" either.
UN-led Syria peace talks concluded on Thursday without any results as the United Nations envoy criticized the Syrian regime for having preconditions for direct talks with the opposition delegation and only discussing the issue of terrorism.
Staffan de Mistura told reporters that "we did not have real negotiations, blaming in particular the government delegation's apparent lack of interest in discussing anything besides the fight against "terrorism".
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Once-fractious opposition groups, cut down on the battlefield by the combined muscle of Russian air power, Iranian militias and the Syrian military, arrived in Geneva with a unified platform after issuing a communiqué that said Assad had to give up power at the start of any political transition.
De Mistura and his team therefore only held separate meetings with both sides.
Ja'afari also blasted de Mistura for his comments on Russian Federation, saying such positions "derail his mandate as a facilitator of the talks, which will have an impact on the Geneva process all together".
Nasr al-Hariri, the head of the Syria opposition delegation, warned that the Geneva talks are in "great danger" - accusing the government delegation of sabotaging them.
The eighth and latest round of peace talks ended in Geneva with little more than hope for a new round in January. Asked whether there was any point in returning to Geneva, de Mistura said the alternative would be abandoning Syria and a return to war.
De Mistura, speaking on Swiss television station RTS on December 13, said failure to make peace quickly through United Nations mediation could lead to "a fragmentation of Syria".
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"His statement undermined his mandate as a facilitator of the talks, which will affect the entire Geneva process", al-Jaafari told reporters on Thursday.
In comments to reporters, he slammed the Syrian opposition for its so-called Riyadh communique, issued in Saudi Arabia before the latest round got underway in Geneva.
He also said his side would not talk directly with the opposition until it drops its demand for Assad to step down.
Russian Federation has provided crucial military and diplomatic backing to Syrian President Bashar Assad's forces.
The latest round of talks began on November 28 with meetings between de Mistura and the opposition.
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