Pro-Iranian units from Iraq moved to Syria to support government forces — a response to unexpected militant advances near Aleppo. The deployment info comes from both militia sources and regional monitoring groups
The militant group Hayat Tahrir al-Sham started a double-sided push towards Aleppo (which happened just days ago); their forces moved into areas around Idlib and Hama provinces. Syrian troops quickly set-up strong defense spots in north Hama trying to slow down the attackers progress
Government air-power hit opposition lines on sunday while troops worked on fortified positions: the defensive efforts showed syrian armys quick reaction to militant moves. The whole situation made Iraqi allies send their fighters to help protect the area from further attacks