Suspected Russian raids kill 25 civilians in Syria's Idlib
The raid hit several areas mostly controlled by rebel groups, the Britain-based SOHR said. Russia is the Syrian regime's main ally in its war against rebels and extremists.
On Monday, suspected Russian air raids killed at least 46 people in opposition-held parts of Syria, the monitoring monitor group said.
In Idlib province at least 26 civilians were killed in suspected Russian strikes on the town of Kafr Nabel.
An eyewitness said warplanes hit several places in the town, including a market.
The Observatory says it determines whose planes carry out raids according to their type, location, flight patterns and the munitions involved.
The group said 18 people were also killed in suspected Russian strikes on the town of Maaret al-Numan.
The monitor reported two additional deaths, one in an earlier strike on Maaret al-Numan and another in al-Naqir, also in Idlib.
It said six civilians, four of them children, had been killed in a government barrel bomb attack on the town of al-Tamanah in the same province.
Russia, a staunch ally of President Bashar al-Assad's government, began a military intervention in support of Damascus in September 2015.
Moscow says it is targeting "terrorists" and has dismissed reports of civilian casualties in its strikes.