Regime air strikes on Saturday killed a woman and six of her children in northwest Syria, a war monitor said, a day after Russian bombardment pummelled a nearby displacement camp.

Syria's state-run media say the country's air defenses have responded to a "hostile target" and destroyed the missile before it reached a central Syrian town.

The SANA news agency said on Friday that the projectile had entered the Syrian airspace overnight from Lebanon's airspace, heading toward the town of Masyaf in Hama province.

Syrian state-run media say government forces have captured a northwestern village and are getting closer to the town of Kfar Zeita, which has been held by insurgents since 2012.

The government-controlled Syrian Central Military Media said on Wednesday that troops captured Arbaeen the night before, following intense clashes with al-Qaida-linked militants.

Clashes between pro-government forces and jihadist-led groups that control Syria's northwest killed at least 45 combatants on Tuesday, a war monitor said.

At least 35 combattants including 26 pro-regime forces were killed Saturday in clashes and air strikes that erupted at dawn in northwestern Syria, a war monitor said.

Regime and Russian air strikes and shelling have killed at least 28 people including seven civilians in embattled northwest Syria, a war monitor said Friday, despite a ceasefire announced by Moscow.

Moscow has announced a ceasefire in Syria's northwestern Idlib province after weeks of intensified rocket fire and air strikes by regime and Russian forces.

"At Russia's initiative, with the mediation of Turkey and Russia, a ceasefire agreement was concluded in the Idlib de-escalation zone as of midnight on June 12," the Russian Reconciliation Centre for Syria said in a statement late Wednesday.

New satellite photos show significant damage to Syrian villages and surrounding farmland as a result of a government offensive on the last rebel stronghold in the country.

The images, provided to The Associated Press by the Colorado-based Maxar Satellites on Tuesday, show fires in olive groves and orchards during harvest season around Kfar Nabudah and Habeet, two villages on the edge of Idlib province where fighting has focused. The fires were apparently sparked by intense bombing in the area.

Syrian air defense batteries on Friday intercepted projectiles coming from Israel and downed a number of them, the official news agency SANA reported.

Belgium, Germany and Kuwait on Wednesday requested an urgent meeting of the UN Security Council to discuss the upsurge in fighting in northwest Syria, diplomats said.