Turkish invasion reinforces ISIS opportunities in Syria

The US Department of Defense (Pentagon) worries that a US withdrawal from northern Syria would lead to a resurgence of Daesh in the country, particularly if the Syrian Democratic Forces (SDF) abandon a number of prisons holding thousands of Daesh fighters across the region to battle Turkey.

The Pentagon's remarks come after US troops pulled out from three observation points in the towns of Ras al Ayn, Tal Abyad and B'er Ashiq in northern Syria, the US-based Alhurra TV channel reported on Monday.

Turkey is preparing to invade Northeastern Syria despite U.S. efforts to de-escalate tensions through a joint security mechanism along the border. Turkish President Recep Tayyip Erdogan announced on October 5 that “We have made our preparations, completed our operation plans” and that air and ground operations will begin within days.

The Syrian Kurdish People’s Protection Units (YPG) are currently withdrawn to 5-14km (varies by location) from the Turkish border in accordance with a US-Turkey security agreement reached on August 27.

Turkey remains unsatisfied with this progress. It has demanded to increase the depth of the security mechanism to 30km and to resettle at least 2 million Syrian refugees residing in Turkey into the zone, which the YPG will not accept.

Erdogan presented this proposal at the UN General Assembly on September 24. Turkish Defense Minister Hulusi Akar reiterated these demands in a phone call with the U.S. Secretary of Defense two days before Erdogan announced that operations will begin.

It is unclear how far into Syria Turkey will attempt to push. Turkey may conduct a limited operation in an attempt to compel the U.S. and YPG to accept Turkey’s demands.

Turkey will likely use Syrian proxy forces in addition to the Turkish Armed Forces (TSK) to conduct the offensive. Head of the Turkish-backed Syrian Interim Government (SIG) Abdurrahman Mustafa announced the merger of the two Turkish proxy forces in Syria under SIG Defense Ministry, during a ceremony in Sanliurfa Province on October 5: the Syrian National Army (SNA) based in northern Aleppo and the National Liberation Front (NLF) based in Idlib.

A greater unification of Turkish proxy forces has previously been an indicator of upcoming Turkish military operations. Turkey previously announced the formation of the SNA in the weeks prior to Turkey’s last offensive against the YPG in January 2018 in the Afrin district of northwest Syria.

The new merger indicates Turkey intends to use this proxy force to clear and hold territory that it seizes. Turkish forces will likely support these proxies with air and fire support. TSK has deployed convoys with armored vehicles and heavy weapons to Akcakale, Sanliurfa Province across from Tel Abyad in Northern Raqqa since October 2.

Turkish Special Forces will likely participate as well. The subordination of Turkey’s military proxies to the SIG indicates that Erdogan intends to assert this entity as the governing authority in areas it seizes, which is consistent with how he has administered areas seized farther west to date.

ISIS may achieve breakout success in eastern Syria if Turkey invades. The military coalition the YPG leads, the Syrian Democratic Forces (SDF), will pull military forces away from detention facilities, IDP camps, and other stabilization tasks south of the border region in order to fight Turkish forces.

An SDF spokesperson stated on October 5 that the SDF “will not hesitate to turn any unprovoked attack by Turkey into an all-out war on the entire border.”

The SDF began to dig trenches south of the border near Tel Abyad on October 5 in anticipation of a Turkish attack. ISIS is already preparing to conduct prison break operations in Syria and Iraq. The SDF’s de-prioritization of the fight against ISIS will provide ISIS an opportunity to accelerate its plans.

The offensive will also leave SDF positions at key oil infrastructure in Eastern Deir ez-Zour Province at risk. Iranian-backed militias and Syrian Arab Army (SAA) units have reinforced positions in Deir ez-Zour in response to three consecutive weeks of anti-Iran and anti-regime protests in SDF-held Deir ez-Zour.

The pro-regime coalition could leverage these reinforcements to launch an offensive to take the oil fields while the U.S. and SDF are distracted in the border areas.