Ukraine’s Security Service and Ukrainian forces reportedly conducted one of the largest series of drone strikes against military facilities within Russia, targeting at least four Russian airbases, on the night of April 4 to 5. 

Ukrainian media reported that sources within Ukrainian security services, including the Ukrainian Main Military Intelligence Directorate, stated that the SSU and Ukrainian forces conducted successful strikes on airfields near Kursk City and Yeysk, Krasnodar Krai; the Engels Airbase in Saratov region; and the Morozovsk Airbase in Rostov region.

These Ukrainian security sources reportedly stated that the Ukrainian drone strikes significantly damaged three Tu-95MS strategic bombers at Engels airbase, damaged two Su-25 fixed-wing aircraft at the airbase near Yeysk, and destroyed six unidentified aircraft and significantly damaged another eight unidentified aircraft at the Morozovsk Airbase.

The Ukrainian strikes reportedly killed four Russian military personnel at the airbase near Yeysk and seven Russian personnel at the Engels Airbase and wounded and killed up to 20 Russian personnel at the Morozovsk Airbase.

Geolocated footage shows explosions and Russian air defenses activating near all the airbases except for the one near Yeysk.

ISW has not yet observed any visual confirmation that Ukrainian forces damaged or destroyed aircraft or infrastructure at any of the airbases. Satellite imagery collected on April 4 indicates that there were three Tu-160 heavy strategic bombers, five Tu-95 strategic bombers, an Il-76 transport aircraft, and a Tu-22 bomber at Engels Airbase; ten L-39 training and combat aircraft, five An-26 transport aircraft, an An-74 transport aircraft, an An-12 transport aircraft, four Su-27 fixed-winged aircraft, four Su-25 fixed-wing aircraft, one Su-30 fixed-wing aircraft, and several Ka-52 and Mi-8 helicopters at the Yeysk Airbase; and 29 fixed-wing aircraft, primarily Su-34s, at the Morozovsk airfield.

The Russian Ministry of Defense claimed that Russian forces intercepted 44 drones over Rostov region, six drones over Krasnodar Krai, and a drone each in Saratov, Kursk, and Belgorod regions on the night of April 4 and into the morning on April 5.

Ukrainian drone strikes have typically only targeted individual airbases within Russia, and Ukraine’s ability to strike four separate airbases in one strike series represents a notable inflection in the capabilities that Ukrainian forces are employing in their campaign against Russian military infrastructure, critical infrastructure, and strategic industries within Russia.

ISW continues to assess that Ukrainian strikes against targets within Russia are a necessary component of Ukraine’s campaign to degrade industries that support the Russian war effort and military capabilities deployed in the Russian rear through asymmetric means. Russian forces routinely use Tu-95 strategic bombers stationed at Engels Airbase to launch Kh-101/Kh-555 cruise missiles at targets in Ukraine, and the Russian military had roughly 60 Tu-95 aircraft as of 2023.

If confirmed, the possible loss of roughly five percent of Russia’s strategic Tu-95 bombers in a single strike would be notable. ISW has also previously observed that the loss of fixed-wing aircraft is not negligible since Russia likely has about 300 various Sukhoi fixed-wing aircraft.

Russian forces are currently using Sukhoi fixed-wing aircraft to conduct guided and unguided glide bomb strikes along the entire frontline in Ukraine and have previously leveraged significantly intensified glide bomb strikes to make tactical gains.

Sustained Ukrainian strikes against Russian airfields within Russia will degrade the Russian Aerospace Force’s  ability to conduct missile and air strikes throughout Ukraine.