Accusing Damascus, the U.S. then launched several dozen Tomahawk cruise missiles at a Syrian airbase, which the opponents of the Syrian government claimed was used as the launch-pad for the alleged gas attack, taking the lives of about 20 people, including both Syrian soldiers and civilians.
Moscow has been one of the key allies of Syrian President Bashar Assad since it launched a military operation in the country, helping him turn the tide of war in his favour.
The US is trying to cover up its own failure to force armed groups in Syria to de-escalate violence as it blames Russia and Iran for ongoing hostilities in Eastern Ghouta, the Russian foreign minister has said.
"With that vote Russian Federation made a commitment to us, to the Syrian people, and the world to stop the killing in Syria", Haley continued.
The evacuees included some 300 militants from the extremist Ajnad al-Sham faction and their families.
Al-Qadam is surrounded by government-held territory on one side and Islamic State-controlled neighbourhoods on the other.
It communicated with Russian Federation through the United Nations to reach the agreement, it said.
Washington has not confirmed any such plan - and a small contingent of USA forces is already in Manbij.
At least 961 children were recruited and used in the conflict in 2017, almost triple the number in 2015, Mercado said.
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The TV showed several women carrying babies and welcoming the Syrian army, claiming the rebels were preventing civilians from leaving eastern Ghouta.
Regime forces have advanced steadily inside Eastern Ghouta on the outskirts of the capital since launching a deadly assault on the rebel enclave more than three weeks ago. "The people here are treating us well but we still have families inside who couldn't leave", she said.
There were fewer fighter planes and strikes on the town on Tuesday, she said, probably as a result of the evacuations - but like many in the area she didn't know how long the arrangement would last.
He did not say when the alleged attack would take place or provide detailed evidence to back his assertions.
Turkey launched its military offensive into the border region to drive out Syrian Kurdish forces that it considers to be "terrorists" and an extension of Kurdish rebels fighting inside Turkey.
"Our Western partners, who don't hide the close contacts they have with [militant groups] in Eastern Ghouta, have failed in their commitment under the UNSC Resolution 2401, which was to influence their proteges, rein them in, and make them stop shelling residential areas [in Damascus]".
In Eastern Ghouta, more than 60 schools were hit by bombardments in the first months of 2018, at least 18 were razed to the ground, and more than 57,000 students have been forced to interrupt their studies or abandon school altogether.(ANSAmed).
Hamza Birqdar, Jaish al-Islam's military spokesman, said in a video online that the fighters would continue to defend their territory until the end.
"There are many Russian advisers, representatives of the Russian Center for Reconciliation of Opposing Sides and servicemen in Damascus and at Syrian defense facilities", the RIA news agency quoted head of Russia's General Staff Valery Gerasimov as saying.