The Organisation for the Prohibition of Chemical Weapons for the first time explicitly blamed the Syrian regime for chemical attacks using sarin and chlorine in 2017.
Cities and towns along the critical highway linking Damascus with Aleppo have become sites of brutal destruction at the hands of the Syrian regime.
The team established by the global chemical weapons watchdog will investigate nine alleged attacks during the country's civil war.
The Kremlin also rebuffed criticism from US President Donald Trump of Russian and Syrian military action in Idlib, saying it was needed to shut down rebel attacks being launched from there.
Syrian opposition forces say that Russia and the Assad regime fabricated the chemical attack story as a pretext to carry out air raids in Aleppo.
The war, which broke out in March 2011, has left 360,000 dead and displaced more than half of the population, millions of whom have fled the country.
In a Wall Street Journal article, Turkish President Recep Tayyip Erdogan called on the international community to take action, and warned that "the entire world stands to pay the price" otherwise.
French President Emmanuel Macron said on Sunday that he persuaded Trump to leave US troops in Syria, but the White House says otherwise.
US President Trump is facing a decision on whether to strike Syria and risk a clash with Damascus ally Russia, after UN members failed to agree on action to probe chemical attacks in the war-wracked country.
Described by the humanitarian officials as a "monstrous campaign of annihilation,” and a possible “massacre,” the Syrian regime’s recent bloody campaign on eastern Ghouta began on February 19.
The bloodshed comes a day after dozens more were killed in the opposition-held area and as the United Nations pleaded for a truce in the seven-year-old war to allow for aid deliveries and the evacuation of the ill and wounded.
At least 21 people reported difficulty breathing in beleaguered opposition Eastern Ghouta town, east of Damascus, says NGO accusing Bashar al Assad's regime of carrying out a new chemical attack.
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