BEIRUT (AFP) - Clashes between anti-authorities opponents and regime forces killed extra than 50 combattants on both sides in northwestern Syria on Tuesday, a war reveal said.

At a meeting in Moscow, the presidents of Turkey and Russia expressed "extreme challenge" over the violence in Idlib province.

Russia-backed regime opponents have for weeks been chipping away at the edges of the jihadist stronghold, which borders Turkey, after bombarding it for months.

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but hardline rebels and jihadists on Tuesday attacked loyalist positions within the south of the bastion, the england-primarily based Syrian Observatory for Human Rights stated.

"Violent clashes east of the city of Khan Sheikhun broke out at sunrise after jihadist and competition groups attacked regime positions," Observatory leader Rami Abdel Rahman stated.

The attack was led by way of the Al-Qaeda-linked Hurras al-Deen group and some other jihadist faction, Ansar al-Deen, he stated.

The clashes killed as a minimum 29 regime forces and 31 rebels and jihadists, the Observatory said in an updated loss of life toll, before authorities troops repelled the jihadists.

in the southeast of the bastion, 8 rebels have been killed seeking to sneak thru frontlines towards regime positions close to the Abu Duhur military airport, the display introduced.

someplace else in southern Idlib, 10 civilians, among them a child, were killed in regime air moves, the Observatory stated.

Regime forces recaptured Khan Sheikhun final week, and have been massing north of the town in recent days.

The city lies on a key dual carriageway strolling through Idlib province, and fully recapturing the artery would allow the government to reconnect Damascus to 2d metropolis Aleppo.

Heavy regime and Russian bombardment has hit areas north of Khan Sheikhun in current days, inside the region of the city of Maaret al-Noman, the next prevent north on the dual carriageway.

On Monday, regime and Russian air strikes killed 12 civilians within the jihadist stronghold, the Observatory stated.

"The state of affairs inside the Idlib de-escalation zone is of significant concern to us and our Turkish companions," Russian President Vladimir Putin said at a press convention with Turkish counterpart Recep Tayyip Erdogan.

He stated Turkey had "valid pastimes" to protect on its southern borders and supported the creation of a protection quarter inside the region.

Putin stated he and Erdogan had agreed "extra joint steps" to "normalise" the scenario in Idlib, however did not offer information.

The Idlib offensive comes no matter a deal signed in September ultimate 12 months by means of Moscow and rebel backer Ankara to preclude a complete-blown assault at the Idlib area which hosts some 3 million human beings.

The presidents of both nations were set to meet in Moscow on Tuesday.

Hayat Tahrir al-Sham -- a collection led by means of Syria s former Al-Qaeda affiliate -- prolonged its administrative manipulate over the whole of Idlib in January, however different insurrection factions continue to be gift.

A spike in bombardment on account that overdue April has killed greater than 920 civilians, the Observatory says. The United international locations says it has induced greater than 400,000 humans to escape their homes.

The Syrian civil war has killed greater than 370,000 humans and displaced hundreds of thousands given that starting in 2011 with the brutal repression of anti-government protests.