Eight attacks. Four dead. That was the Islamic State's entire national output across Syria in May 2026 — a group that a U.S. ally's intelligence chief had, only months earlier, warned was ballooning toward 10,000 fighters. Two numbers, two completely different stories, and only one of them survived contact with what actually happened after the Syrian Democratic Forces collapsed in January.
The Story Everyone Told in December — And Why It Flipped
By December 2025, the narrative around ISIS in Syria had hardened into something close to consensus: a resurgent insurgency, a green-on-blue attack in Palmyra that killed two American troops and a U.S. civilian interpreter, and a retaliatory air campaign — Operation Hawkeye Strike — that hit more than 70 targets in a single night. That version of events wasn't wrong about December. It was wrong about what came next.
What actually happened between January and June 2026 is a story almost nobody was predicting: the Kurdish-led SDF lost its military standoff with Damascus, American troops finished leaving the country entirely, and — against every intuition about power vacuums — ISIS attacks did not spike. They collapsed by roughly 72% from their 2025 pace, according to Middle East Institute tracking of the group's operational tempo.
The Numbers That Actually Moved
Here's the answer to the question most people are typing into search bars right now: is ISIS getting stronger or weaker in Syria in 2026? The honest answer is weaker, sharply, and for reasons nobody in the counterterrorism establishment fully expected.
| Period | What happened | ISIS attack trend |
|---|---|---|
| 2025 average | SDF still controlled northeast Syria | ~29 attacks/month, 15 deaths |
| Jan–Apr 2026 | SDF militarily defeated, forcibly integrated | Down 17% |
| Apr–Jun 2026 | Full U.S. troop withdrawal completed | Down a further 67% |
| May 2026 | Post-withdrawal baseline | 8 attacks, 4 deaths nationwide |
Analysts at the Soufan Center describe this less as eradication and more as recalibration — a group whose old recruitment engine, built on Arab resentment of SDF rule, stalled out the moment that rule ended.
Here is the detail that upends the resurgence narrative entirely: ninety percent of ISIS's 2025 attacks happened specifically in territory the SDF controlled — not in regime areas, not in the desert corridors everyone worried about, but in the exact zones where Kurdish authorities governed a majority-Arab population. When that governance arrangement disappeared in January 2026, so did the group's single largest source of new recruits. The insurgency didn't get contained by more firepower. It got starved by a political settlement nobody had bet on.
How the SDF Actually Fell
The collapse wasn't a battlefield rout so much as a forced merger. Early in 2026, Damascus moved to bring the Syrian Democratic Forces under the Ministry of Defense's chain of command — a process that had been agreed in principle back in March 2025 but stalled for months over implementation details. Four Kurdish brigades, roughly 5,200 soldiers, were formally absorbed into the Syrian army; another 10,000 Kurdish police, including at least 1,000 women, moved under the Ministry of Interior.
The handover wasn't clean. When Syrian government forces took control of facilities like the sprawling al-Hol displacement camp — previously guarded by the SDF and holding thousands of ISIS-linked women and children — security gaps opened immediately. Riots and escape attempts spiked during the transition window, exactly the kind of custodial chaos that counterterrorism officials had feared for over a year.
The Withdrawal Gamble Washington Actually Made
Why would the United States pull its remaining troops out of Syria at precisely the moment intelligence officials were warning about a militant buildup? The Trump administration's bet was that finishing the exit — rather than delaying it — would force Damascus to own the counterterrorism file completely, with no American safety net to fall back on.
That bet traces back to a diplomatic opening most security analysts underweighted at the time.
By February 2026, the Washington Post confirmed the detainee transfer to Iraq was complete, clearing the way for withdrawal despite open concern about whether Damascus could hold the line alone. Adm. Brad Cooper, the CENTCOM commander, told the Senate in May that the U.S. would keep working with Damascus pragmatically rather than through direct troop presence — a formal acknowledgment that the relationship had shifted from occupation to advisory partnership.
The Detainee Question Nobody Has Fully Answered
Moving 7,000 people between two countries' prison systems in a matter of weeks was never going to be tidy. Iraq accepted the transfer as a preventive measure against a Syrian prison break, but it created a different long-term liability: battle-hardened fighters now sit inside an Iraqi penal system already strained by corruption and overcrowding, with every incentive to organize from the inside.
Analysts caution that quieter attack numbers should not be read as the movement having been neutralized.
I keep coming back to one uncomfortable fact here: the same overcrowded, undertrained detention system that failed to contain ISIS ideology in Syria for a decade is now the system holding its most committed veterans in Iraq. Moving the file across a border changed the jurisdiction. It didn't change the conditions that made prisons into recruitment schools the first time around.
Iraq's Parallel Anxiety
Baghdad watched the Syrian handover with open alarm. Iraq's intelligence chief, Hamid al-Shatri, told the Washington Post in January that ISIS ranks across the border had swollen five-fold in barely a year — a figure the U.S. military couldn't confirm and the UN Security Council put far lower, but one that shaped Iraqi policy regardless. Baghdad fortified its western border with Syria with five layers of barriers and accelerated its own planned drawdown of the U.S.-led coalition, targeting full American withdrawal by the end of 2026.
What does an ordinary Iraqi border town actually feel from this? A tank column parked along the Sinjar frontier, a spike in vetting checkpoints, and a political system that just tilted toward a harder-line, more Tehran-aligned prime ministerial candidate — because Baghdad's Shia leadership read the Syrian chaos as proof that only a stronger security state could hold the line.
What Could Still Reverse This
None of this is a closed case. The Islamic State's own leadership has explicitly called for expelling remaining Western influence from Syria, and small-scale attacks on buses, oil tankers, and even judges continued into June 2026 even as the overall count fell. Isn't it strange that a security success story and a live insurgency can both be technically true at the same time? That's exactly the tension Syria sits in now.
Three things would most likely flip the trend back upward: a breakdown in the Kurdish integration process that reopens the Arab-tribal grievances ISIS previously exploited, a mass escape from Iraq's now-overloaded detention system, or a political vacuum in Baghdad that leaves counterterrorism coordination under-resourced during the transition away from coalition support.
Frequently Asked Questions
No — attack levels fell sharply through the first half of 2026, dropping around 72% after the SDF's collapse and the U.S. troop withdrawal, according to Middle East Institute tracking. The group retains cells and intent, but its operational output has hit a multi-year low rather than the resurgence some late-2025 assessments predicted.
Damascus moved to enforce a March 2025 integration agreement, absorbing Kurdish brigades and police into the Syrian military and interior ministry. The transition triggered security gaps at ISIS detention camps like al-Hol, but ultimately removed the governance arrangement ISIS had relied on for recruitment in Arab-majority areas.
Roughly 7,000 detainees were transferred from Syrian facilities to Iraqi custody between January and February 2026, a joint U.S.-Iraq-Syria effort to prevent a mass breakout during the SDF handover. Many now sit in Iraq's Al-Karkh Central Prison and similar facilities awaiting trial.
Yes, the U.S. completed its troop withdrawal from Syria by mid-2026, shifting to a pragmatic advisory relationship with Damascus rather than direct military presence. A parallel drawdown in Iraq is targeted for completion by the end of 2026.
A breakdown in Kurdish-Arab integration, a mass escape from Iraq's strained detention system, or a political vacuum in Baghdad during the coalition drawdown are the three most likely triggers analysts point to for a renewed ISIS resurgence.
Sources & References
- The Soufan Center, "Not Resurgence, but Recalibration: ISIS in Syria," IntelBrief, June 2026
- Middle East Institute, "The Collapse of ISIS in Syria," June 2026
- The Washington Post, "ISIS threat spiking as militant ranks in Syria swell, Iraqi official says," January 2026
- The Washington Post, "Transfer of ISIS suspects concludes as Trump pursues Syria exit," February 2026
- Small Wars Journal (Arizona State University), "Preventing ISIS' Rising Resurgence After Syria's Power Shift," March 2026
- The Soufan Center, "Domestic and Regional Challenges Intersect in Iraq," January 2026
- SpecialEurasia, "Iraq: Security Risk Assessment and Terrorist Threat in 2026," February 2026