On Saturday, the Russian military said it had obtained "irrefutable" data that terrorist groups, including Jabhat Al-Nusra, and the infamous White Helmets, had already met in Idlib province and plotted the final scenarios for a false-flag chemical attacks in the cities of Jisr ash-Shugur, Serakab, Taftanaz and Sarmin.
However, experts from the United Nations and the Organisation for the Prohibition of Chemical Weapons (OPCW) have said government forces were behind an attack involving the nerve agent Sarin on a rebel-held town in southern Idlib in April 2017 that killed more than 80 people.
Four deaths were reported in the village of Abdeen after the bombings on Saturday, while another person is said to have been killed in Halba village.
"The legitimate Syrian government has a right and must eventually take under control all of its national territories", Putin told Iran's Hassan Rouhani and Turkish leader Recep Tayyip Erdogan at the summit.
UK Ambassador to the United Nations, Karen Pierce, speaks to the United Nations Security Council during a meeting about a chemical attack on former Russian spy Sergei Skripal and his daughter using a military-grade nerve agent, at the U.N. headquarters in New York City, U.S., September 6, 2018.
More than 350,000 people have been killed and millions displaced since Syria's civil war started in 2011 with the repression of anti-Assad protests.
"We don't want Idlib to be turned into a bloodbath", he stressed.
Syrian regime troops have for weeks been massing on the edges of the province which borders Turkey, raising fears of another humanitarian disaster in Syria's seven-year conflict.
Idlib is the insurgents' only remaining major stronghold and a government offensive could be the last decisive battle in a war that has killed more than half a million people and forced 11 million to flee their homes.
As they discussed the fate of Idlib, US Ambassador to the United Nations Nikki Haley was talking tough in NY, telling the Security Council that the United States would consider any assault on the province as a "dangerous escalation" of the conflict that has already claimed more than 400,000 lives and forced more than 5 million Syrians to flee the country.
Syria and Russian Federation have carried out their most intensive air raids in weeks on rebel positions in the northern province of Idlib, activists say. Clashes rarely erupt there over turf control and authority, and are usually a reflection of deepening political tension between the uneasy partners. This prompted the clashes, which lasted no more than 20 minutes, Sheikmos said.
The US-backed Kurdish administration has recently begun talking with the Syrian government, seeking government recognition of its self-rule areas. But in recent days, the Damascus government announced that it will be holding local administration elections, including in Kurdish-ruled areas, undermining the negotiations with the Kurds and their proposal for self-rule. They seized the territories, with the backing of the USA -led coalition, after driving out Islamic State militants.