The opposition is deliberating whether to participate in the national dialogue conference in Sochi, Russia.
As with eight previous rounds of failed UN-backed talks in Geneva, there was no sign that the warring sides had met face to face at discussions meant to lay the groundwork for a new post-war constitution.
He said it was "vital to end all violence and restore full respect for Syria's sovereignty, territorial integrity, unity and independence and for the legitimate aspirations of the Syrian people through a Syrian-led and owned process facilitated by the United Nations".
The opposition will decide in the next two days whether to attend Sochi, its chief negotiator Nasr Hariri, said on Wednesday.
"I share the vast frustration of millions of Syrians inside and outside the country at the lack of a political settlement to date", De Mistura said.
In Vienna, the Syrian Negotiations Commission (SNC) announced it would not be attending the Sochi conference.
The U.N. -brokered peace talks with the Syrian government and opposition began Thursday, a few days before separate negotiations hosted by Damascus's close ally Russian Federation that the West views with suspicion.
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"Russia is going to present in particular its project for a new Syrian constitution", said Adjar Kourtov, analyst at the Russian Institute for Strategic Studies (RISI).
It's unclear, however, if Assad, having retaken Aleppo in 2016, will want to negotiate, especially if he feels confident of winning back Idlib, the last major province held by rebel forces.
Assad's forces were on the defensive in the first few years of the war, but since Russian Federation militarily intervened in 2015 they have regained the upper hand.
The US and its allies have been constantly blocking the Russian proposal to adopt a United Nations Security Council resolution or a statement of its chairman condemning the acts of chemical terrorism in the Middle East, where militants not only use toxic chemicals, but also acquired capabilities to make warfare agents by themselves, said the ministry.
The brutal Syrian war, which has claimed more than 340,000 lives since 2011, has grown even more complex over the past week with Turkey launching a ground operation against Kurdish fighters in northern Afrin. Syria's opposition group agrees and says it will boycott Sochi.
More than 340,000 people have died in the war, millions have fled their homes and the fighting has left the country in ruins.
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