Ukrainian drones breach Moscow's air defenses in largest attack since war began

On a Saturday in May, Ukrainian drones slipped through Moscow's layered defenses in what would become one of the largest aerial assaults on the Russian capital since the war began. The strikes hit energy infrastructure, military factories, and apartment buildings. At least three civilians died in the chaos. By Sunday morning, the Russian Defense Ministry claimed to have shot down 556 drones approaching the city—a staggering number that underscored both the scale of the attack and the apparent limits of even the most heavily fortified air defense system in Russia.

The moment exposed a peculiar vulnerability. Pavel Zarubin, a journalist with Kremlin connections, posed an uncomfortable question to Putin's spokesman Dmitri Peskov as smoke still rose from the weekend strikes: Russia possessed some of the most destructive weapons on Earth, yet here were Ukrainian drones, worth only thousands of dollars each, penetrating the defenses of a nuclear superpower. "It seems you can bite and nibble at a nuclear power," Zarubin said. Peskov's response was measured but revealing. He insisted that Russia's nuclear arsenal remained the foundation of national security and deterrence, implying that conventional attacks, however brazen, did not cross the threshold that would warrant nuclear retaliation.

Moscow is the most heavily defended city in Russia. The Defense Ministry has constructed multiple concentric rings of anti-aircraft batteries stretching from Podolsk, about 40 kilometers south of the capital, to Sergiyev Posad, roughly 70 kilometers to the northeast. The innermost rings are among the densest, deployed between 2025 and the present year. Visitors to central Moscow can see anti-aircraft cannons and radar domes mounted on administrative buildings, especially around the Kremlin itself. Beyond the city limits, along highways, older structures and even a decommissioned ice rink have been repurposed to mount air defense systems. Electronic jammers scramble GPS signals throughout the capital, confusing taxi navigation systems. The authorities cut internet access during attacks to blind drones that rely on network connectivity to reach their targets. Russian phone cards automatically deactivate outside the country and must be manually reactivated at the border—a measure designed to prevent Ukrainian drones carrying such cards from connecting to Russian networks once inside the country.

The arsenal defending Moscow includes the Tor-M2 short-range surface-to-air missile system, capable of hitting targets at 10 kilometers altitude traveling at 3,600 kilometers per hour, and the Pantsir system, which combines short-range rockets with anti-aircraft cannons. Open-source military analysts have counted as many as 89 Pantsir systems arranged in concentric rings around the capital. Longer-range S-400 systems provide defense against ballistic missiles and aircraft, with engagement ranges between 40 and 400 kilometers. Yet these expensive systems prove nearly useless against drones flying at low altitude with minimal radar signatures, costing only thousands of euros compared to the millions spent on air defense missiles.

Mark Krutov, a military analyst at Radio Free Europe specializing in open-source intelligence, has spent years studying Moscow's defenses using satellite imagery and street-level photos from Google and Yandex. He noted with dry humor that a Pantsir system he had geolocated in 2023 "had quite a lot of work this Sunday." By analyzing photos and videos posted by residents after the weekend attack, Krutov reconstructed the exchange of fire between Ukrainian drones and Russian air defenses. He observed that the blurring of sensitive military sites on Yandex maps—done at the request of Russian intelligence services—actually makes the job easier for amateur analysts, since the pixelation itself marks the location of important targets.

One of the most fortified zones in the region is Novo-Ogaryovo, home to one of Putin's official residences and the compounds of other senior officials. Putin's protection is extreme. His mansion in Valday, in Novgorod region between Moscow and Saint Petersburg, has at least 27 anti-aircraft systems deployed around it, according to Krutov. In December 2025, Moscow accused Kyiv of attempting to assassinate Putin at that location, claiming to have shot down more than 90 drones. Ukraine denied the charge, saying the attack targeted military installations in northwestern Russia. American intelligence later concluded that Kyiv had made no attempt on Putin's life.

Antipating Ukrainian retaliation, Moscow's Anti-Terrorism Commission banned the distribution of drone attack images and footage on social media four days before the Saturday bombardment. Residents posting videos faced administrative fines of 3,000 to 5,000 rubles—roughly 35 to 60 euros. The prohibition proved ineffective. Videos flooded the internet showing residents' shock as drones moved freely over a region that had felt largely untouched by the war for more than four years. The weekend attack also prompted Russian strikes on Dnipro and Odesa in eastern and southern Ukraine, wounding multiple civilians. Zelensky had justified Ukraine's action as a response to Russia's resumption of bombing Ukrainian cities after a brief pause around Victory Day.

The incident illuminated what one analyst called the paradox of stability-instability: nuclear deterrence reduces the risk of direct conflict between nuclear powers but intensifies asymmetric clashes with non-nuclear adversaries, since responding with weapons of mass destruction would be irrational. Peskov's calm assertion that Russia's nuclear arsenal remained unshaken and that conventional attacks posed no existential threat suggested Moscow understood this calculus. Yet the fact that such attacks were possible at all—that drones could penetrate the defenses of the world's most heavily armed capital—left an uncomfortable question hanging in the Moscow air.