Russia, Turkey and Iran - the tripartite states mediating for peace in Syria - have signed a memorandum on creating de-escalation zones in the war-torn Arab country.
The Syrian government, backed by Russian Federation and Iran, agreed to the deal Thursday, but members of the opposition delegation walked out on the talks rather than sign their agreement, according to state-run media reports from Turkey and Russian Federation.
The opposition has protested Iran's participation at the conference, accusing it of being a party in the war that's killed some 400,000 people.
As a result, the guarantor countries agreed to sign a memorandum on the creation of de-escalation zones in Syria.
An angry opposition delegation said they would never accept Iran as a military guarantor of a peace process, and claimed there was a huge gap between Russian promises and actions. The latter group, which is affiliated with Al Qaeda, has changed its name to the Organization for the Liberation of Syria but is still widely known as the Nusra Front.
Both countries support Syrian president Bashar al-Assad.
"In light of the failures of past agreements", Nauert's statement said, "we have reason to be cautious".
A Russian plan to set up "de-escalation zones" in Syria is to go into effect at midnight on Friday, but it will be at least another month before all the details are worked out and the safe areas are fully established, according to Russian officials.
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Putin said Russian and Syrian government jets would halt flights over the specified zones if all sides respect the cease-fire.
Turkey's foreign ministry said the zones would cover the whole of Idlib province, portions of the Latakia, Aleppo, Hama and Homs provinces, as well as the Ghouta suburb of Damascus.
It remains unclear precisely how the guarantors will monitor compliance with what they are calling "de-escalation zones".
Yet tensions remain, and Erdogan said he had personally shown Putin at the talks a photograph purportedly showing Russian forces in Syria with Kurdish militia that Ankara deems to be a terror group.
"The Secretary-General welcomes the commitments to ceasing the use of all weapons, particularly aerial assets; to rapid, safe, and unhindered humanitarian access; and to creating conditions for the delivery of medical aid and meeting civilians' basic needs", the statement said.
There was no immediate comment from the Jordanian Foreign Ministry, which along with the United Nations and the USA, attended the talks in the Kazakh capital as observers.
Lavrentyev, whose remarks were carried by Russian news agencies, said USA -led coalition aircraft would be able to operate against Islamic State of Iraq and Syria (ISIS) militants in specific areas, but the "de-escalation zones" were now closed to their flights.