Ukraine responds to mass Russian strike with large overnight attack

Ukraine launched a large-scale retaliatory strike campaign overnight into May 15, targeting oil refining infrastructure, military-industrial facilities, and Russian military bases across multiple regions of Russia and occupied territory, following one of the most intense Russian aerial bombardments of the war in recent memory.

The Russian attack that preceded Ukraine’s response involved 1,567 strike drones and 56 missiles, according to Ukrainian sources, making it among the largest single aerial assault packages deployed against Ukrainian cities since the full-scale invasion began in February 2022. Ukraine’s counterstrike, coordinated across multiple drone brigades and the Center for Deep Strike of the Unmanned Systems Forces, struck targets stretching from the Ryazan region of central Russia to occupied Crimea, the Krasnodar Krai, and the Caspian port city of Kaspiisk.

The most confirmed strike of the night hit the Ryazan oil refinery, located approximately 180 kilometers southeast of Moscow. Ryazan Governor Pavel Malkov officially confirmed the attack, stating that drone debris fell on the territory of an industrial facility. A large fire broke out at the refinery and was visible in footage circulated on Russian social media. Malkov also confirmed that two residential buildings sustained damage, three people were killed, and 12 others were injured, including children. Evacuation of residents was underway, and authorities were clearing damaged structures, according to the governor’s statement. The Ryazan refinery, one of Russia’s significant petroleum processing facilities, has been targeted in previous Ukrainian long-range strike campaigns, as documented by open-source monitoring communities tracking strikes on Russian energy infrastructure.

Operators of Ukraine’s 1st Separate Unmanned Systems Center confirmed striking a Beriev Be-200 Altair amphibious aircraft and a Kamov Ka-27 helicopter in the Russian city of Yeysk, located on the Azov Sea coast in Krasnodar Krai. The Be-200 Altair is a Russian-built jet-powered flying boat used in maritime patrol, search and rescue, and firefighting roles, with military variants operated by the Russian Navy for coastal surveillance. The Ka-27 is a naval helicopter widely deployed across Russian surface combatants and shore bases for anti-submarine warfare and search and rescue. Losing both aircraft at a single location represents a meaningful strike against Russian naval aviation assets in the Azov-Black Sea theater, if the reported hits are confirmed through independent damage assessment.

The same unit also confirmed striking a Pantsir-S1 air defense system in temporarily occupied Crimea. The Pantsir-S1, known by its NATO reporting name SA-22 Greyhound, is a combined gun and missile short-range air defense system that Russia has deployed extensively to protect high-value assets across occupied Ukrainian territory and within Russia itself. Ukrainian drone forces have targeted Pantsir systems repeatedly throughout the war, recognizing that degrading Russia’s layered air defenses creates corridors for subsequent strikes. Additionally, the 1st Center reported striking a dry cargo vessel carrying ammunition in Berdyansk, a port city on the Azov Sea currently under Russian occupation and used as a logistics hub for Russian forces in southern Ukraine.

Ukraine’s 427th Separate Brigade “Rarog” confirmed striking a Tor-M2 air defense system in Luhansk Oblast. The Tor-M2, known in NATO nomenclature as the SA-15 Gauntlet, is a short-to-medium range surface-to-air missile system designed to engage aircraft, cruise missiles, and precision-guided munitions at low to medium altitudes. Its destruction in Luhansk Oblast, if confirmed, removes another layer from Russia’s regional air defense network in the occupied east.

The 414th Brigade “Ptakhy Madyara,” operating jointly with the 20th Brigade K-2, struck a training center and a temporary deployment point in Luhansk Oblast, according to both units’ official Telegram channels. The targeting of a training center carries particular operational weight: Russia has relied heavily on training facilities in occupied and border regions to cycle mobilized personnel toward the front, and disrupting that pipeline compounds pressure on an already strained Russian manpower system.

Reports also emerged of strikes against Russian military vessels in the Caspian Sea, though independent confirmation remained limited at the time of writing. The open-source monitoring community Exilenova+, which tracks strikes on Russian territory, reported striking a military vessel in Kaspiisk and noted what it described as a large number of casualties. Kaspiisk, located on the Caspian coast in the Republic of Dagestan, hosts Russian naval infrastructure including Caspian Flotilla assets. The Caspian Flotilla has been used by Russia to launch cruise missile strikes against Ukraine from outside the range of most Ukrainian drone and missile systems, making it a strategically significant target if the reported strikes hold up under further scrutiny.

The scale and geographic spread of Ukraine’s overnight campaign signals a deliberate strategic logic. Striking oil refining capacity in central Russia applies economic and logistical pressure on the Russian war machine. Hitting air defense systems in Crimea and Luhansk degrades the shield Russia uses to protect its own strike assets. Targeting naval aviation in Krasnodar and vessels in Berdyansk and potentially the Caspian chips away at Russia’s ability to project power across multiple maritime domains simultaneously.