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Russian President Vladimir Putin, right, meets with Jordan's King Abdullah II in the Kremlin in Moscow, Russia, Wednesday, Jan. 25, 2017. Image Credit: AP

Beirut: A powerful terrorist group has crushed a Free Syrian Army rebel faction in northwestern Syria, in an attack that threatens to deal a critical blow to the more moderate wing of the Syrian rebellion and derail new Russian-backed peace talks.

The Jabhat Fateh Al Sham terrorist group, formerly known as Al Nusra Front, launched an attack on a number of FSA groups in northwestern Syria on Tuesday, accusing them of conspiring against it at peace talks in Kazakhstan this week.

The fighting has engulfed the rebels’ last major territorial stronghold in northwestern Syria, prompting a major Islamist insurgent faction to warn on Wednesday that it could allow President Bashar Al Assad and his allies to capture the area.

Officials with two FSA factions said Fateh Al Sham had overrun areas held by the Jaish Al Mujahideen group west of Aleppo. One of the officials said he expected other FSA factions to face the same fate unless they could get better organised to defend themselves - something they have so far failed to do.

The Syrian insurgency has been hamstrung from the outset by divisions among rebel groups fighting Al Assad, including the ideological split over whether to pursue Islamist terrorist goals or the more nationalist agenda backed by FSA groups.

“Al Nusra wants to end the FSA,” said the FSA official, speaking on condition of anonymity because of the sensitivity of the subject. If it succeeded, “the ones who attended Astana will be finished”, he added, referring to the talks in Kazakhstan.

Those talks were backed by Al Assad’s two main allies - Russia and Iran - and by Turkey, which has supported many of the FSA groups in northern Syria. Russia mobilised the new talks after helping Al Assad to defeat the rebels in Aleppo last month.

Fateh Al Sham was Al Qaida’s official wing in the Syrian war until it announced it had cut those ties last year.

Internationally viewed as a terrorist group, it has been excluded from all diplomatic efforts to end the Syrian conflict, including a recent truce brokered by Russia and Turkey.

Since the new year, Fateh Al Sham has been targeted by a spate of US air strikes. That included an attack by a B-52 bomber which the Pentagon said killed more than 100 Al Qaida militants.

Fateh Al Sham said in a statement published on Tuesday it had been forced to act preemptively to “thwart conspiracies” being hatched against it. It said “conferences and negotiations” were “trying to divert the course of the revolution towards reconciliation with the criminal regime (of Al Assad)”.

It also accused rebel factions that attended the Astana talks of agreeing to “isolate” and fight it, and said its foes were giving away its positions to the US-led coalition.

Fateh Al Sham is one of the most powerful groups in the remaining territory held by the rebels in northwestern Syria, including Idlib province. While it has often fought in close proximity to FSA rebels against Al Assad, it also has a record of crushing foreign-backed FSA groups.

Ahrar Al Sham, a major Islamist faction that also fights in the Idlib area, issued a general call-up of fighters to “stop the fighting in any form”. Coming down on the side of the FSA groups, it accused Fateh Al Sham of rejecting mediation efforts that the FSA groups had accepted.

Ahrar Al Sham, a conservative Islamist group, is widely believed to be backed by Turkey. In a voice message posted on YouTube on Wednesday, Ahrar Al Sham leader Abu Ammar Al Omar said: “If the fighting continues and if one party continues to do an injustice to another, then we will not allow this to pass, regardless of the cost, even if we become victims of this.”

Meanwhile, Russian President Vladimir Putin thanked Jordan’s King Abdullah on Wednesday for supporting the Astana talks.

Abdullah said Russia was playing a critical role in solving the crisis in Syria. Putin said the Astana talks would become the basis for separate, UN-led negotiations in Geneva. The king said he fully supported the talks, adding that Russia plays a critical role for the solving of the region’s issues.