For weeks, regime troops backed by Russian Federation and Iran have massed around Idlib's periphery, with deadly airstrikes, shelling, and barrel bombs falling with increased intensity in recent days.
The video was published just days after a trilateral summit in Tehran, attended by Russian President Vladimir Putin and his Iranian and Turkish counterparts, to discuss the situation in Idlib, ahead of the Syrian Army's impending offensive.
Can the US change the trajectory of a potential humanitarian catastrophe in Idlib?
It was the heaviest bombardment since August 10, when at least 53 civilians were killed in Idlib and the neighbouring province of Aleppo, he said. "I won't give you more details, but this is your warning", the militant said in video footage circulating on social media. "Russia, Iran and Turkey have demonstrated, not on paper but in real life, that they can find compromise solutions in the most hard situations".
Fielding questions after a policy speech in Washington on Monday, Bolton said the Western alliance was ready to pound Syria in case the government of President Bashar al-Assad resorted to what he claimed was a "third use" of chemical weapons.
Hundreds of civilians have fled villages near the front line in Syria's Idlib province fearing an imminent regime assault on the country's last major opposition and rebel bastion, a monitor said.
"We're deeply concerned about this recent escalation of violence, which has resulted in the displacement of over 30,000 in the area".
Turkey massed tanks and commandos at its frontier and accelerated work to cope with a possible surge of refugees after Russian Federation refused to call off an offensive against the last rebel bastion in Syria.
"The Astana process is ongoing, and with the help of the process we will have tangible results", he said, referring to the trilateral process with Iran and Turkey.
The Observatory described the attacks on the rebel-held areas as the "most intense" since August and said they killed four in Abdeen, west of Khan Sheikhoun town, including two children and a woman.
The UN warned Monday at least 30,000 residents in Idlib have been displaced in the first nine days of this month amid a Russian and regime air campaign there.
On Friday, Turkish President Tayyip Erdogan said his country could no longer afford to take in any more refugees from Syria.
More than three million people have fled to Idlib and as many as 70,000 opposition fighters are dug in there.
Turkey has renewed calls for worldwide backing for a ceasefire in Idlib, telling the United Nations security council that an all-out assault on Syria's rebel-held province would trigger a huge wave of refugees and could threaten Europe.
Mr Swanson said that since Friday, mortar and rocket attacks had increased, especially in the northern Hama countryside and southern Idlib rural areas.
"We go wherever it's safe", said the man in his 30s.
Syria has been ravaged since 2011 by a complex civil war, implicating many foreign powers, that has claimed more than 350,000 lives to date.