The White House on Tuesday warned Syrian President Bashar al-Assad that if he uses chemical weapons against his people again, the USA and its allies "will respond swiftly and appropriately".
On Tuesday, Russian warplanes resumed air strikes on Idlib after a 22-day pause.
The Trump administration issued a series of new sanctions on the embattled regime of Syrian President Bashar al-Assad ahead of what USA officials believe is an "imminent attack" by the regime with help from Russian Federation and Iran, according to an announcement by the Treasury Department.
Idlib's population has swelled as the regime chalked up a series of victories in other parts of the country, reaching evacuation deals that saw tens of thousands of people bussed to the northwestern province.
Speaking Thursday at the United Nations Security Council, U.S. Ambassador Nikki Haley said the Assad regime "and its backers must stop their military campaign in all its forms to allow the U.N. -led political process to have a chance to succeed".
"Around 180 families, or some 1,000 people" have fled their homes since Wednesday night towards rebel territory further east, said Observatory head Rami Abdel Rahman.
"The strike was conducted on terrorist stockpiles located outside residential areas, where unmanned aerial vehicles were stored, Konashenkov said".
But regime backers Russian Federation and Iran have sworn to wipe out "terrorists" and Syrian President Bashar al-Assad has declared his determination to retake control of the entire country.
"That Russia is seeking to plant false lies about chemical weapons use suggests that Moscow is seeking to deflect from its own culpability when these heinous weapons are used", Commander Sean Robertson, a Pentagon spokesman, said in a statement.
Washington warned Tuesday that if Damascus were to use chemical weapons, it would respond.
Turkish newspaper Sabah Gazetesi leaked highlights of the Turkish proposal on Idlib, indicating that Erdogan will propose a plan that would see Turkish forces on the ground who are already manning checkpoints around Idlib oversee the dissolution of 12 armed groups, including the former al Qaeda-affiliated group HTS.
"Any offensive is to us objectionable as a reckless escalation" he said.
Iran's President Hassan Rouhani will host his Russian and Turkish counterparts Vladimir Putin and Recep Tayyip Erdogan this afternoon.
Many of those living in Idlib are rebels and civilians who were bussed out of their hometowns in other parts of the country that have come back under regime control.