Russian drone and missile strikes killed at least 10 people and injured more than 76 others across Ukraine over the past 24 hours, Ukrainian officials reported Sunday.

The fatalities occurred in five regions: three in Kherson from separate incidents, two in Odesa, two in Donetsk, two in Zaporizhzhia, and one in Sumy. Russia launched 269 drones overnight, of which Ukrainian forces downed or jammed 249. Nineteen drones achieved direct hits across 15 locations, and one ballistic missile strike was recorded, with additional damage from falling debris.

In response, President Volodymyr Zelensky announced Ukrainian drone strikes on three oil tankers belonging to Russia's shadow fleet at the entrance to the Black Sea port of Novorossiysk. "These tankers were actively used for transporting oil. Now they will not be," Zelensky stated in a Telegram post accompanied by black-and-white video footage showing a naval drone approaching one of the tankers.

Zelensky also reported hits on an oil tanker, a patrol boat, and a Karakurt-class corvette, a warship designed to carry Kalibr cruise missiles, at Russia's Primorsk oil terminal on the Baltic Sea near Finland. The terminal's infrastructure sustained significant damage. The operation was led by Chief of the General Staff Andrii Hnatov, with involvement from Ukraine's Security Service counterintelligence and Navy personnel.

Russia's shadow fleet consists of aging vessels used to circumvent Western sanctions on Russian oil exports imposed since the full-scale invasion in 2022. Ukrainian strikes on such infrastructure have disrupted billions in Russian oil revenue this year, according to Zelensky.

Russian authorities downplayed the impact of the Ukrainian attacks, amid Kremlin concerns over the deepening reach of Kyiv's drones. Moscow announced a scaled-back military parade on May 9 due to a "terrorist threat" from Ukraine. Separately, Ukraine launched at least 334 drones targeting Russia's north-western Leningrad region.

The exchanges highlight escalating tit-for-tat aerial campaigns in the fourth year of Russia's invasion. Ukraine has intensified long-range strikes on Russian energy assets and military targets, while Moscow continues mass drone and missile barrages on Ukrainian cities and infrastructure.