Inside Ukraine's secret counteroffensive in heavily fortified Donbas

Ukrainian forces are conducting a secret counteroffensive in Donbas, focusing on the liberation of Shandryholove. The operation, named Vivaldi, has seen significant advances despite heavy Russian defenses and minefields. Soldiers utilized drones for reconnaissance and strikes, minimizing risks during their advance. The operation has liberated 277 square kilometers and demonstrated the potential for infantry advancement in a drone-dominated battlefield. Challenges included navigating extensive minefields and Russian underground defenses, with tactics evolving to maintain the element of surprise against Russian troops.