Ukraine Reveals Secret Counteroffensive Operation Vivaldi in Northern Donetsk, Clearing Russian Infiltrators

Ukraine's 3rd Army Corps commander, Brigadier General Andrii Biletskyi, confirmed a counteroffensive codenamed "Vivaldi" in northern Donetsk Oblast, saying units cleared 75 square kilometers of Russian infiltration and liberated a further 10 square kilometers, including the settlements of Novoselivka, Oleksandrivka, Yarova, Serednie and the outskirts of Korovii Yar 123. Biletskyi's unit said the operation inflicted roughly 1,500 Russian casualties and destroyed more than 12,000 drones along with hundreds of armored vehicles and artillery systems, attributing the losses to Russia's 20th and 25th Combined Arms Armies 12. The 3rd Corps also reported disrupting Russian fuel logistics, saying strikes forced Moscow to relocate fuel and lubricant supplies to Voronezh Oblast after a pipeline was shut down and warehouses destroyed 1. Biletskyi said the offensive, named for Vivaldi's Four Seasons, represents only its "first season," called for continued operational silence, and did not disclose further objectives 123. Reuters said it could not independently verify the commander's claims 3.