Ukraine has completed its Operation Vivaldi, aimed at protecting its fortress belt cities of Donetsk Oblast, which helped Kyiv preserve the region from Russian occupation for 12 years. Brigadier General Andrii Biletskyi, the commander of the Third Army Corps behind the operation, has reported that the fourth phase secured 101 km² of territory. Among the latest achievements is the liberation of three settlements—Zelena Dolyna, Lypove, and Kolodiazi.

The operation's main objective was to move Ukrainian troops into more advantageous defensive positions, Biletskyi said in the first days after the operation was made public. Vivaldi has now summed up the results of all four phases: Ukraine has established full control over 16 settlements, liberated 277 km² of territory, and inflicted 8,000 casualties on Russian forces.

Ukraine worked against Russia's deadline

During Operation Vivaldi, Ukrainian forces have prevented Russian troops from outflanking the Sloviansk-Kramatorsk agglomeration and cutting the Kharkiv–Sloviansk highway, a key supply route for Ukraine’s forces in Donbas, Biletskyi says.

“We thwarted the offensive of the Zapad grouping and forced it to redeploy some units of the 1st Tank Army, which eased pressure on Kupiansk-Vuzlovyi,” Biletskyi announces.

Previously, the Institute for the Study of War noted that Russian President Vladimir Putin was confident that Russian forces would be able to seize the entire Donetsk Oblast by the end of 2026 — the Kremlin’s latest deadline for achieving this goal.

Ukraine’s military was on a mission to prevent this.

Season one: clearing russian infiltration groups

On 15 September 2026, Ukraine’s Third Army Corps announced Operation Vivaldi in northern Donetsk Oblast. During the first phase, Ukrainian troops cleared Russian groups from 75 km² of territory and liberated another 10 km².

The Third Army Corps said it had struck Russian supply routes and fuel infrastructure, prompting Russia to relocate its fuel and lubricant reserves to Voronezh Oblast. According to the corps, Russian forces lost around 1,500 troops, more than 12,000 drones, and hundreds of pieces of equipment.

Season two: liberation of Shandryholove and Derylove

On 20 September, the Third Army Corps reported the liberation of Shandryholove and Derylove and the establishment of full control over Drobysheve.

During the second season, Russian forces lost another 800 troops, bringing their total losses across the first two seasons to more than 3,000, according to the corps.

During the first two seasons of the operation, Ukrainian troops and attached units regained control of 125 km² of territory, including 50 km² that had been fully liberated.

The first phase of Vivaldi involved eliminating Russian groups that had infiltrated Ukrainian positions, explained the commander of a battalion in the 125th Brigade, callsign Darwin, per ArmyInform. After clearing those groups, the Defense Forces moved on to the operation’s second phase, using reconnaissance drones to detect Russian forces, he added.

For this, Ukraine used UAVs and ground robotic systems.

“The Third Army Corps was the first in the world to begin deploying ground robotic systems by air. Our heavy bombers deliver kamikaze ground robotic systems more than 10 kilometers behind enemy lines,” Biletskyi noted.

Season three: advances near Novе and Ridkodub

On 28 September, the Third Army Corps reported the liberation of Nove, Ridkodub, and Katerynivka and the restoration of control over Karpivka and Novomykhailivka. Ukrainian forces regained another 51 km² of territory, bringing the total area liberated since the start of the offensive to 176 km². Russian forces lost around 2,000 troops, and more than 250 were taken prisoner, the corps said in its summary of the operation’s third phase.

“The Russians were convinced that the main axis of attack was Shandryholove–Zelena Dolyna. This led it to squander its reserves in counterattacks along that very axis. The Russians slept through the actual strike, which was focused on capturing Nove,” Biletskyi said.

Operation Vivaldi aimed to disrupt Russia’s plans in Donetsk Oblast

The need for Operation Vivaldi arose amid Russian attempts to encircle Ukraine’s fortified belt in Donetsk Oblast. Ukrainian forces conducted preparatory efforts aimed at degrading Russia’s offensive capabilities, including strikes on Russian drone operators, the Institute for the Study of War reported on 9 October.

Ukrainian counterattacks in the Lyman direction and east of Sloviansk and Kramatorsk were intended to complicate Russian efforts to seize the fortified belt in Donetsk Oblast, the report noted.

The corps advanced gradually, reclaiming small areas instead of attempting a large-scale breakthrough.

Ukraine’s presidential adviser Serhii Beskrestnov said SpaceX had imposed a 100 mph (160 km/h) speed limit on its military Starshield service overnight into 14 October, disrupting several missions without warning Ukraine’s defense forces.

Ukraine’s forces use Starlink-connected drones to strike Russian positions and logistics, including targets behind the front line. Unlike earlier restrictions introduced at Kyiv’s request to stop Russian forces from exploiting Starlink, the latest change reportedly targets the military Starshield service and was imposed without warning Ukraine’s military.

What the new restriction covers

Beskrestnov wrote that the restriction applies to the “military package” of Starshield services. He said the move “obviously cannot be a coincidence” and was connected with the “current political situation,” but did not explain what he meant.

Activist Serhii Sternenko, a former adviser to Ukraine’s defense minister, reported that connections began disappearing at speeds above 160 km/h. He suggested SpaceX had acted at the Trump administration’s request but provided no evidence. Starlink does not work inside Russia, and the drones hitting Russia’s oil industry use other means of communication, Reuters noted. Sternenko added that the ordinary satellite terminals were still working.

Later on 14 October, Sternenko wrote that, according to military reports, restrictions had been tightened further, with connections starting to drop at 60–70 km/h. Beskrestnov later warned that the restriction also hits Starlink-linked interceptor drones, which he called Ukraine’s most effective current defense against jet-powered Shaheds.

Front-line units report dropped connections

Ukraine’s 7th Rapid Reaction Corps confirmed the disruptions in a statement to Reuters. The corps’ press service told Novynarnia that its units on the Huliaipole front began experiencing problems overnight. The corps said the change affected drones controlled through Starlink in flight and concerned Starshield’s data-transmission speed, which it said had previously been unrestricted.

The corps said connections could disappear for 10–20 seconds at movement speeds of 110–120 km/h, complicating drone control. Flying slower creates its own risk, it said, because “slower targets become more vulnerable to being hit by the enemy.”

Some high-speed drones, particularly mid-range strike models, must reach high speed quickly, the corps said. An unstable connection “will make it impossible to launch such aircraft or use them as intended.” Since the start of the day, one unmanned systems unit on the Huliaipole front had to cancel some missions because of connection problems, the corps said.

Earlier limits came at Kyiv’s request

In late January, SpaceX began restricting Starlink in Ukraine at Kyiv’s request after Russian forces started mounting terminals on strike drones. After Russian drones struck a passenger train in Kharkiv Oblast on 27 January, Beskrestnov, then an adviser to the defense minister, suggested one of them may have been controlled via Starlink. In early February, Ukraine introduced a whitelist under which only registered terminals could continue operating. Beskrestnov called the earlier countermeasures “temporary” and “emergency.”

SpaceX had not publicly commented on the restriction, and Ukraine’s Defense Ministry was looking into its cause, Radio Svoboda reported. Polish Foreign Minister Radosław Sikorski asked Elon Musk on X whether he was “playing politics with your products again,” adding: “As your European customers, we are watching you.”