Syrian activists said Sunday airstrikes believed to be from Russian planes killed at least 18 people and wounded 40 others in northern Syria.
The strike is reported to have hit a busy marketplace.
The Britain-based Syrian Observatory for Human Rights, which monitors the violence in Syria, said the strikes happened in Ariha, a town in Idlib province about 20 kilometers from the Turkish border.
The area is controlled by Islamist fighters, including the al-Qaida-linked Nusra Front. It is not an area where the Islamic State group is active.
Russia began its air campaign in Syria in September, and has drawn criticism from the U.S. and others in its coalition of militaries conducting their own airstrikes in Syria for targeting rebel fighters and not Islamic State militants.
In a meeting in Damascus on Sunday with senior Iranian adviser Ali Akbar Velayati, Syrian President Bashar al-Assad said his opponents have increased funding and weapons in the wake of bolstered support for government forces from Iran and Russia, state media reported.