Opposition fighters in the southern province of Daraa announced a ceasefire deal late on Friday with regime ally Russia.
More than 300 people have been killed in the rural eastern Ghouta district on the outskirts of Damascus since Sunday night, and many hundreds have been wounded, according to human rights monitors.
Eastern Ghouta is now the last opposition-controlled pocket around Damascus and Syrian President Bashar al-Assad has dispatched reinforcements there in an apparent bid to retake it.
The local government in Afrin accused Turkey of creating a "humanitarian crisis" by killing at least 160 people and displacing tens of thousands since the start of its three-week-old offensive.
The Syrian army statement said the airstrike killed two people and caused material damage near the town of Masyaf and warned against the "dangerous repercussions of this aggressive action to the security and stability of the region".
A commando operation backed by Russian warplanes and helicopters has killed 25 members of the Islamic State jihadist group in central Syria, a monitor said on Sunday.
Warplanes launched three air strikes on the Libyan city of Derna on Monday, a witness said, days after Egypt attacked camps there, saying it was targetting militants responsible for killing Egyptian Christians.
Turkish warplanes hit Kurdish militant targets in northern Iraq on Wednesday and killed six militants, the military said, in a second day of cross-border raids.
Syrian warplanes hammered opposition-held neighbourhoods of Damascus on Monday after regime forces pushed back a surprise assault that saw rebels try to fight their way into the city centre.
Syrian and Russian warplanes carried out dozens of air strikes on rebel-held districts of Aleppo on Friday, a monitor said, as world powers prepared for new talks on a ceasefire.