WorldHow Ukraine’s Operation Vivaldi pushed back Russian forces in Donbas

In May 2026, Ukraine’s 3rd Army Corps launched a secret counteroffensive, now known as Operation Vivaldi, to reinforce defenses in the Lyman and Sviatohirsk sectors and disrupt Russia’s plans to encircle Sloviansk and Kramatorsk. The report examines how Ukrainian forces pushed Russian troops back as battlefield drone threats grew.