In the early days of the latest escalation in the Middle East, Iran’s persistent drone attacks have begun to test the resilience of US and allied defense systems, effectively transforming the conflict into a grueling war of attrition. The use of waves of inexpensive Shahed-136 drones against military installations, oil infrastructure, and civilian areas across the region has forced defenders to rely heavily on costly missile interceptors, raising concerns about the sustainability of munitions supplies on both sides.
The Shahed-136 drones, which function essentially as simple, one-way cruise missiles, have been deployed continuously since the US and Israeli airstrikes on Iran commenced last Saturday. Despite the high interception rate of over 90 percent by US-supplied Patriot missile systems, the financial imbalance between the attacking drones and defensive interceptors is striking. Each Patriot missile costs approximately $4 million, whereas a single Shahed drone is estimated to cost around $20,000. This stark contrast highlights a growing challenge faced by Western militaries, one that has been increasingly evident since the conflict in Ukraine, where adversaries have used inexpensive weapons to rapidly deplete expensive defensive stockpiles.
Experts warn that if the current pace of attacks and interceptions continues, both Iran and the US could see their missile and drone inventories significantly diminished within a matter of days or weeks. Kelly Grieco, a senior fellow at the Stimson Center, emphasized the strategic implications of this dynamic, noting that the side capable of sustaining its arsenal longer will hold a decisive advantage in the ongoing conflict.
Meanwhile, Gulf countries involved in the defense efforts are reportedly feeling the strain. Internal assessments suggest that Qatar, for instance, could run out of its Patriot interceptors in as little as four days if the current rate of usage persists. This looming depletion has reportedly led to discreet appeals for a swift resolution to the hostilities to avoid further escalation and resource exhaustion.
On the Iranian side, the scale of their drone and missile capabilities appears substantial. Following last year’s conflict with Israel, Iran is believed to have retained a stockpile of around 2,000 ballistic missiles. However, the inventory of Shahed drones is thought to be far larger. Drawing parallels with Russian drone production rates, analysts estimate that Tehran could be manufacturing hundreds of these drones daily. Since the conflict began, Iran has launched over 1,200 projectiles, many of which are likely Shahed drones, possibly preserving their ballistic missiles for longer-term strategic use.
Iran’s military operations seem to be conducted with a high degree of autonomy. Foreign Minister Abbas Araghchi revealed that Iranian units are operating independently, following broad strategic directives rather than centralized command, which may contribute to the relentless tempo of drone deployments.
On the US side, logistical and operational challenges could limit the ability to maintain prolonged offensive and defensive actions. Although former President Donald Trump suggested that US forces might sustain strikes for up to four weeks, military analysts caution that current munitions reserves may not support such an extended campaign. Defense Secretary Pete Hegseth reiterated that the ongoing military operations are not intended to be indefinite, signaling a cautious approach to resource management.
In the initial phase of the conflict, Iran’s air defense systems, including Russian-made S-300 missile batteries, were targeted and degraded, allowing US and Israeli aircraft relatively unimpeded access to Iranian airspace. The US and its allies primarily depend on Patriot PAC-3 missiles and THAAD systems to intercept incoming threats, with each THAAD interceptor costing around $12 million. Additionally, fighter jets employ Advanced Precision Kill Weapon System (APKWS) missiles, which add tens of thousands of dollars per shot to the operational expenses.
Despite the high costs, alternative anti-drone technologies remain limited in the region. Israel’s Iron Beam laser system, designed to counter small aerial threats like drones, has yet to be deployed in combat, leaving missile interceptors as the main line of defense against the persistent drone onslaught.
Experts warn that if Iranian drone attacks continue unabated at the current intensity, the stockpiles of PAC-3 interceptors in the region could be dangerously depleted within days, potentially leading to a military stalemate. Ankit Panda, a senior fellow at the Carnegie Endowment for International Peace, pointed out that while Iran might exhaust its missiles and drones, the regime could still maintain control despite the chaos. The first 60 hours of this conflict strongly suggest that such a prolonged, attritional scenario is becoming increasingly likely.
