U.S. Withdrawal from Iraq and Syria Puts Region at Risk of ISIS Resurgence

The United States recently concluded its military withdrawal from both Iraq and Syria, marking the end of a decade-long effort to combat the Islamic State in the Levant (ISIL). This strategic retreat aims to mitigate the risk of creating a power vacuum that could be exploited by proxy militias, regional adversaries, or terrorist organizations. However, despite the significant reduction in ISIL's operational capacity over recent years, concerns persist about the group’s potential resurgence without sustained international support.

The absence of American military presence reduces costs and personnel risks for the U.S., but it also diminishes its ability to monitor and disrupt terrorist activities effectively. This withdrawal limits Washington's visibility into ISIL networks and undermines security relationships that were crucial in maintaining regional stability. Moreover, the lack of a forward operating base means that early detection and disruption of threats are now more challenging.

Recent months have seen a series of attacks attributed to ISIL across Syria, indicating strategic recalibration rather than diminished capacity. In June alone, ISIL launched multiple assaults targeting oil tankers, commercial trucks, security checkpoints, military headquarters, political figures, judges, and buses transporting Ministry of Defense personnel. These incidents underscore the ongoing threat posed by ISIL despite its reduced operational footprint.

In July, a bomb attack in Damascus killed ten people at a café frequented by Justice Palace officials, while two more bombs exploded during French President Emmanuel Macron's state visit to Syria, resulting in fatalities near high-profile locations such as the Four Seasons Hotel and Ministry of Tourism. These attacks highlight ISIL’s evolving tactics and its ability to strike beyond traditional hotspots.

The stability of counterterrorism infrastructure is critical but has been compromised by the U.S. withdrawal. This includes the dissolution of the Counter-ISIS mission and the closure of detention camps like Al Hol and Al Roj, which were instrumental in containing ISIL affiliates. Additionally, prison systems have become a focal point for ISIL's strategic initiatives, with the group increasingly relying on prison breaks to bolster its ranks.

Iraq faces particular challenges given the influx of 5,700 ISIS-affiliated prisoners from northeast Syria following the collapse of the Syrian Democratic Forces (SDF) in January. These prisons are already overcrowded and under-resourced, raising concerns about humane treatment and fair trials for those charged with terror crimes. The U.S. presence had facilitated better conditions and reduced ISIL’s ability to exploit these facilities for recruitment and organization.

In Syria, there is apprehension over the Syrian forces' capacity to sustain ISIL's defeat in light of recent incidents involving ISIS infiltration into the Syrian Army and high-profile plots beyond traditional areas of operation. Breakout attempts from Syrian prisons, such as the 2022 attack on Al Sinaa prison and a January attempt at the Shaddadi detention facility, further exacerbate these concerns.

Throughout its counterterrorism efforts in Iraq and Syria, American forces provided critical support through intelligence gathering, airpower, special operations capacity, logistics, and local partnerships. This assistance was vital for monitoring ISIL's rapidly evolving tactics and maintaining regional security dynamics. Without these resources, the likelihood of increased ISIS plots and attacks is high, necessitating creative solutions to fill the emerging security gaps.

Washington, along with its partners and the Iraqi and Syrian governments, must now explore alternative methods to maintain stability in the region. Strengthening relationships between Syria and Iraq with their neighbors—Jordan, Turkey, Lebanon, and other regional players—is crucial for preventing a rollback of counterterrorism progress. Failure to do so could compel the U.S. to re-engage militarily once again.

The complexities surrounding ISIL’s persistence highlight the ongoing need for international cooperation in addressing terrorist threats, even as major powers like the United States reassess their military commitments abroad.