Ukrainian forces have launched a multi-phase military operation named Vivaldi in the Donbass region, aimed at breaking the Russian encirclement around Ukrainian positions. According to reports from The Kyiv Independent and the Institute for the Study of War (ISW), the Ukrainian army claims to have regained 176 square kilometers of territory in the Donetsk region during this operation. The operation was officially announced in mid-September by Brigadier General Andrii Biletskyi, commander of the Ukrainian 3rd Army Corps, and took place north of the city of Lyman. The Vivaldi operation, named after Antonio Vivaldi's Four Seasons, was a multi-stage counter-offensive that began discreetly before its public announcement. By September 15, the Ukrainian command had already claimed the liberation of several sectors. The first phase involved clearing approximately 75 square kilometers of positions occupied by Russian forces and reclaiming an additional 10 square kilometers. Key areas liberated included the village of Serednie and several locations around Novoselivka, Yarova, Oleksandrivka, and Korovyi Yar. The second phase focused on the area northeast of Lyman, with Ukrainian forces announcing the recapture of Shandryholove, Derylove, and Drobysheve. On September 20, the Ukrainian 3rd Army Corps claimed an additional 50 square kilometers during this phase and the neutralization of 800 Russian soldiers. The third phase was the most significant, involving the liberation of Nove, Ridkodub, and Katerynivka, along with the restoration of control over Karpivka and Novomykhailivka, all located north of Lyman. This phase added 51 square kilometers to the total claimed territory, bringing the overall total to 176 square kilometers. Nove was identified as a strategic location, with its surrounding heights offering a tactical advantage over a Russian bridgehead. Ukrainian forces reportedly concealed their true axis of attack, misleading Russian forces into expecting a main assault between Shandryholove and Zelena Dolyna. This diversion forced Russia to deploy reserves in that area, while the real offensive aimed at capturing Nove. The Vivaldi operation utilized advanced technologies, including unmanned ground vehicles (UGVs) for transport, demining, and attacking Russian positions. Heavy drones were used to deploy these robots up to 10 kilometers behind Russian lines. The Ukrainian army also reportedly converted old Soviet BTR-60 armored vehicles into remote-controlled suicide vehicles to target strong Russian defenses. Combined with drones, electronic jamming, and long-range strikes, these tactics disrupted Russian communications and surveillance, reducing the effectiveness of Russian drones and electronic warfare. The element of surprise led to significant surrenders, with the 3rd Army Corps claiming more than 250 Russian soldiers captured during the third phase, including officers, artillerymen, and drone operators. Entire units reportedly surrendered, according to Ukrainian command. The human cost for Russia is difficult to verify, with Ukrainian forces announcing approximately 2,000 soldiers killed or wounded during the third phase. According to The Kyiv Post, Russian forces may have recorded over 3,000 deaths after the first two phases, while the Ukrainian 3rd Army Corps’ website claims 5,000 Russian soldiers were killed during the first three phases. These figures are still evolving and not yet fully verified. The Vivaldi operation has slowed the Russian offensive in the Donbass but has not necessarily led to the collapse of the Russian front. Fighting continues, and Moscow still holds significant military capabilities in the region. The fourth "season" of the Vivaldi operation is yet to come, with the challenge ahead being whether Ukraine can consolidate the regained positions, exploit Russian disorganization, and turn this local breakthrough into a lasting advantage.