The Turkish President Erdogan changed his position on Idlib after his recent visit to Moscow. He stopped the supplies to the 'rebels' to allow the Syrian campaign against them to succeed. The so called 'rebels' it has long supported now turn against it.

Another data point that confirms that take is a sudden lack of anti-armor missiles in the hand of the 'rebels':

The use of anti-tank guided missiles (ATGM) by militant groups against the Syrian Army in Idlib province has fallen to almost zero as of the final days of August.
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Since the Syrian Army kicked-off its Greater Idlib ground offensive against Islamist groups in early May, about 100 guided missiles from various systems have been used by militant groups during the three and a half months since.

It is pretty obvious that Turkey ended its missile supply to the 'rebels':

[O]ne only needs to assess the current attitude on pro-militant social media right now - an attitude which is highly critical of Turkey's lack of intervention in Idlib, a major part of this lack of intervention being identified by these sources as the sudden "collapse" (or rather, withholding) of ATGM supplies by Turkey.

The cutting off of supplies for the Jihadists in Idlib and the closing of the borders to 'rebels' who want to flee to Turkey made the country a target for those fighters. The Turkish president may well have calculated that killing their leaders now will lessen the danger of getting attacked by them.

Sending no warning to Russia or Turkey, the US bombed an array of targets within Idlib, Syria, killing numerous civilians and threatening the hard-earned truce across the province, the Russian Defense Ministry said.

The air raid led to "multiple casualties and destruction" around two villages in the Idlib province, where a fragile ceasefire between government forces and militants is still in place, the Russian Reconciliation Center said on Sunday. The airstrike, carried out on Saturday, "endangered the truce" and "violated all previous arrangements."

Earlier, US Central Command (CENTCOM) said it targeted leaders of a group it calls al-Qaeda in Syria. The strike "will further degrade their ability to conduct future attacks and destabilize the region," it claimed.

But it hit shortly after Syrian government forces began a unilateral truce in the rebel-held province, Russia's Defense Ministry noted. The Syrian Army is still sticking to the ceasefire despite militant attacks provoked by the US bombing.

"A number of anti-tank missiles were fired from Lebanon towards an Israel Defense Forces base and military vehicles. A number of hits have been confirmed," the IDF said in a statement on Sunday, adding that the Israeli military is "responding with fire towards the sources of fire and targets in southern Lebanon."

An IDF spokesman said later in the afternoon that while hostilities appeared to be over, Israeli forces remain on alert.

"We do not have factories to produce precision-guided missiles in Lebanon," Nasrallah said, speaking to supporters on Saturday night, his comments cited by Reuters.

Hezbollah already has enough precision missiles for 'any confrontation' with Israel, big or small, Nasrallah added.

Commenting on the recent drone attacks in Beirut, which Lebanese authorities blamed on Israel, Nasrallah said the attacks open a dangerous door to killings and political assassinations in Lebanon.

According to the Hezbollah leader, the appropriate "response" to Israel's "aggression" is now 'in the hands of field commanders, who know what they must do', and 'what the limits are'.

"We want the enemy to remain confused because we left all the options open," Nasrallah said. Israel "must pay a price" for its actions, he added.