Russia's Air Defense Missile Crisis: How Ukraine's Drone Campaign Is Creating a Porous Sky

Russia is facing an acute and worsening shortage of S-300 and S-400 interceptor missiles, driven by Ukraine's mass-drone campaign, that analysts describe as potentially "unsustainable." This shortage is creating widening gaps in Russia's air coverage and enabling Ukraine to strike deeper into Russian territory than ever before.

The scale of the interceptor depletion

CBS News reported on June 17, 2026, citing sources, that Russia is running low on a key type of missile interceptor, weakening its ability to defend against Ukrainian drones . Ukraine's Commander-in-Chief Oleksandr Syrskyi confirmed in late April that Russian air defenses are losing their ability to repel drone attacks specifically due to a missile shortage . The shortage extends beyond S-300 systems to Pantsir systems as well .

A RUSI assessment from December 2025 concluded that Russian industry cannot replenish anti-aircraft missile stocks fast enough due to Ukraine's massive use of cheap drones . S-300 missile production takes 7–8 months per cycle , while Ukraine's drone production has ramped up dramatically, allowing it to destroy Russian air defense assets at a rate that has tripled in recent months . Ukraine destroyed twice as many air defense and radar assets in April 2026 as in October 2025 .

174 air defense assets destroyed in five months

Ukraine's Unmanned Systems Forces (SBS) confirmed that its units struck 174 Russian air defense assets between January and May 2026, including surface-to-air missile systems, radar stations, and electronic warfare equipment, at a total cost to Russia of approximately $5.4 billion . In April alone, 38 pieces of equipment worth ~$1.1 billion were hit, including Tor, Tor-M2, Pantsir, and ZU-23-2 systems .

One Japanese researcher tracked a net loss of 322 Russian air defense components from June 2025 to March 2026 — a reduction of 35% of the 908 components monitored . S-300 and S-400 component numbers fell in every Russian military district, with the Central district seeing an 81.8% reduction and the Leningrad district a 76.9% reduction .

Russia repurposing S-300s for ground strikes — further depleting stockpiles

The Hudson Institute reported that between April 8–10, 2026, Russian forces struck Ukrainian drone production plants using modified S-300 and S-400 surface-to-air missile systems in a surface-to-surface role . This dual use further depletes the interceptor stockpile meant for air defense.

Russia has also been using S-300s and S-400s to strike ground targets in Ukraine since at least 2022, in part due to shortages of high-precision missiles . ISW reported in January 2026 that Russian forces were even using RM-48U surface-to-air training missiles for ground strikes, possibly equipped with live warheads .

Supply chain constraints and component shortages

Russia's ability to produce new interceptors is constrained by a production cycle of 7–8 months for S-300 missiles and broader industrial limitations that RUSI identified as insufficient to keep pace with combat losses . The shortages extend to microelectronics, imported components, and vulnerable logistics nodes .

Russia is also reportedly cutting missile production and redirecting funding to increase drone output, further limiting its ability to replenish interceptor stocks .

Ukraine's own Patriot interceptor shortage

The Ukrainian Air Force reported on May 8, 2026, that it is experiencing a shortage of air defense missiles following Russia's extensive winter offensive, stating that "launchers allocated to specific units and batteries are only partially filled – and that's an understatement" . This affects Patriot and other Western-supplied systems. Ukraine's interception rate for Russian munitions dropped below 70 percent in April 2026, an alarmingly low figure .

Ukraine's strike range expanded dramatically

The Ukrainian Defense Ministry stated on April 28, 2026, that deep-strike range against Russia has increased more than 2.5 times since 2022, from ~630 km to over 1,700 km . On April 29, Ukraine struck an oil pumping station 1,500 km inside Russia near the Ural Mountains . By late May, Ukraine's HUR confirmed drones with a range of up to 3,500 km, with the previous maximum being 1,750 km . Over 70% of Russia's population now lives within range of Ukrainian drones .

SBS commander Major Robert "Madyar" Brovdi said that Ukrainian forces are formally scaling up middle-strike and deep-strike operations, with middle-strike drones operating at depths of 50 to 250 km from the front line maintaining live operator contact . In May 2026 alone, Ukrainian forces launched more than 1,300 long-range drone strikes against targets deep inside Russia .

Bottom line

Russia's air defense network is under severe strain from a combination of interceptor missile depletion, physical destruction of launchers and radars, and an inability to produce replacements faster than Ukraine can expend cheap drones. The situation has created a widening window for Ukrainian deep strikes, while Ukraine itself faces its own air defense shortages from Russia's missile campaigns. Russia's vast territory — 17 million square kilometers — makes comprehensive coverage impossible, with analysts noting its skies have become effectively "porous" .