The Eroding Shield: Air Defenses Against Iran
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Executive Summary
U.S., Israeli, and Arab air defenses have intercepted over 90 percent of Iranian missiles and drones fired during the war, thanks to years of deliberate preparation and cooperation. The deliberate surge of additional U.S. THAAD batteries, Patriot systems, carrier strike groups, and 200 fighter aircraft into the theater before the war substantially bolstered existing layered defenses and enabled the architecture to absorb Iran’s opening salvos. Offensive U.S. and Israeli strikes have significantly degraded Iran’s ability to even launch ballistic missiles and drones, and linked warning systems and shared sensor coverage allows more than a dozen U.S. partners to work together to defeat Iranian projectiles.
However, Iran entered this war with a plan to dismantle the architecture that enables that impressive intercept rate. That plan achieved early successes and continues to deliver. Strikes on major radar systems and their communications links to interceptor batteries have eroded the detection and warning network required for effective air defense. Drones, Iran’s cheapest and most abundant projectiles, frequently drawing on Russian tactical innovations from the Ukraine war, have proven far harder to detect and defeat than its missiles, and produced more than double the hits. Ballistic missiles armed with cluster munitions, making up more than half of Iranian missiles fired at Israel, have scattered damage across wide areas even when the missile itself is intercepted. Smaller, more frequent Iranian salvos keep civilian populations under constant alert even as ballistic missile fire has declined. Iran’s sustained attacks on Gulf energy infrastructure and shipping have driven oil prices sharply higher and effectively shut the Strait of Hormuz, imposing economic costs that high interception rates alone cannot prevent.
Although U.S. air defense systems have performed well, the defensive architecture shows signs of deterioration. Gulf nations and Israel both reportedly have warned that interceptor stocks are approaching critical levels. Meanwhile, fragmented national air defense inventories and Iranian damage to radars and sensors are degrading the regional air defense architecture’s ability to sustain effective operations. Air defense support from America’s allies from outside the Middle East have added marginal capability but are coming too slow to address the core shortfalls.
The United States must act now to address each of these pressure points before the defensive architecture erodes further. Washington should reposition assets toward the points of greatest pressure, prioritize counter-drone defense by fielding legacy point-defense systems, transfer interceptor stocks from other theaters, clear the procurement and fielding barriers that have kept capable systems from reaching the fight, intensify offensive strikes against Iranian launchers in eastern Iran, devote a greater number of naval and air assets to escort shipping through the Strait of Hormuz, and formalize the regional air defense coordination that wartime improvisation has proven essential but that remains ad hoc. Over the long-term, the United States should pursue defense industry co-production with Middle East partners to expand the industrial capacity available to replenish the interceptors and munitions this war is consuming.
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