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.

A Russian attack on Sloviansk on 13 October wounded members of a Ukrainian Red Cross team, the Ukrainian Red Cross Society reported. The same day, a Russian bomb hit the city’s invincibility point, one of the state-run hubs where residents warm up and charge phones when power goes out.

Help is getting harder to reach in Sloviansk. Public transport stopped after a Russian strike on two buses in nearby Kramatorsk killed 30 people on 8 October. From 1 November, a curfew from 16:00 to 11:00 will cover nearly all of Donetsk Oblast’s free territory. The people providing help are hit too. Russian drones struck three ambulances in Kramatorsk on 5 October. In August, a Russian strike destroyed a World Health Organization humanitarian warehouse in Dnipro.

Team had moved from Lyman

Three members of the society’s Lyman city branch were hurt. The branch had moved to Sloviansk because of the security situation and kept working there. All three were hospitalized with shrapnel wounds and burns. The building where the team worked took heavy damage, and a fire caused by the attack damaged the organization’s property.

The society’s Donetsk Oblast branch later added that a fourth person suffered a concussion, and that all four were hospitalized. The Red Cross condemned attacks on civilian infrastructure and humanitarian workers.

Bomb hit the warming center

The strike came at 12:45 in the Lisnyi microdistrict, Sloviansk city military administration head Vadym Liakh wrote. He later identified the weapon as a FAB-250, a 250-kg air-dropped bomb. Eight people were injured, and five apartment blocks were damaged, Liakh said. He described the warming center’s building as damaged, while Suspilne Donbas reported it destroyed.

Two Russian strikes on Sloviansk that day killed at least one person, Donetsk Oblast head Vadym Filashkin wrote. Liakh said a Russian attack on the Semenivka neighborhood killed a 55-year-old woman. On 14 October, Filashkin reported that Russian attacks killed three people across Donetsk Oblast on 13 October, in Sloviansk, Druzhkivka, and Starovarvarivka.

Russian drones hit Ukraine's power grid, warehouses, a food warehouse, a home-improvement store, and a farm overnight on 9 October, Ukrainian officials and emergency services reported. The strikes triggered emergency power cuts in Kyiv and other regions and killed at least three people across the country.

As Russia continues its daily terror attacks, it has likely begun its winter strike campaign early, aiming to make civilian life in Ukraine unbearable, ISW assessed. Those strikes now reach beyond the grid to the businesses that store and sell goods, adding to damage Ukraine's Economy Ministry expects to reach up to $10 billion this year.

Power cut in Kyiv and other regions

Russia launched 136 drones overnight, 93 of them jet-powered, Ukraine's Air Force said. Air defenses downed or suppressed 114. Drones hit eight locations, and debris fell at seven more.

DTEK, Ukraine's largest private energy company, introduced emergency power cuts on Kyiv's right bank and in the Bucha and Vyshhorod districts on the grid operator's orders. Ukrenergo, the national grid operator, imposed emergency outages in some regions, citing the strain Russian attacks put on the system. Planned schedules were suspended there. Hourly cuts across parts of Ukraine had already been set for the whole day.

The cuts came a day after a Russian strike knocked out several grid elements supplying Kyiv, leaving many consumers without power. Russia has sharply stepped up attacks on Ukraine's energy system in recent weeks, deliberately targeting power lines and transformers, Ukraine's Energy Ministry said.

Warehouses and a store

In the Bucha district of Kyiv Oblast, Russia hit warehouses and injured three people, Ukraine's State Emergency Service said. One was hospitalized. Rescuers were searching for a woman who may be under the rubble.

In Odesa, a strike damaged the roof of a warehouse storing food and started a fire, the region's emergency service reported. In the south of the oblast, Russia damaged buildings at holiday resorts and destroyed a café.

Near Chernihiv, Russia hit a site just outside the city after 03:00, the city council said. A Suspilne correspondent at the scene reported that a drone hit the Epicenter store, part of a large Ukrainian home-improvement chain. Russian forces also struck a farm in the Kulykivka community. No one was hurt in Chernihiv Oblast.

Russia has already destroyed more than two-fifths of Ukraine's modern warehouse space.

Three killed overnight

In Zaporizhzhia, Russia struck near an apartment building, killing a man, the Zaporizhzhia Oblast administration said. The number of injured rose to nine, including a 14-year-old girl, regional prosecutors said. One strike landed near an after-school education center.

In Ivano-Frankivsk, falling drone debris started a fire, and a man born in 1959 was killed, Ivano-Frankivsk Oblast head Svitlana Onyshchuk said.

In Shyroka Balka, Kherson Oblast, a Russian drone dropped explosives on a house at about 06:20, killing a 74-year-old woman and injuring a 68-year-old man, regional prosecutors reported.

Russia injured three women in a Kharkiv suburb, Kharkiv Oblast head Oleh Syniehubov said. In the Nikopol district, a 24-year-old woman was injured, Dnipropetrovsk Oblast head Oleksandr Hanzha said.

Poland scrambled military aircraft as Russia struck targets in western Ukraine, its Operational Command said.

The past day's toll

Over the past 24 hours, Russia killed two people and injured 18 in Zaporizhzhia and the Zaporizhzhia district, regional council head Ivan Fedorov said. In Sumy Oblast, one man was killed and 14 people were injured, including two 12-year-old boys, the regional administration reported.

In Kherson Oblast, four people were injured, including a child, Kherson Oblast head Oleksandr Prokudin said. In Mykolaiv Oblast, a Russian drone injured two children aged three months and one year, acting oblast head Heorhii Reshetilov said. Three people were injured in Kharkiv Oblast, Syniehubov reported.

In Donetsk Oblast, Russia killed 35 people and injured 25 on 8 October, Donetsk Oblast head Vadym Filashkin said. Thirty-two of them died in Kramatorsk, most in a Russian bomb strike on two passenger buses.

Ukrainian forces are advancing east of Sloviansk and Kramatorsk, and even Russian milbloggers now acknowledge it, the Institute for the Study of War (ISW) said on 8 October. The gains may follow months of groundwork like the one that preceded Operation Vivaldi near Lyman, which Ukraine says returned 176 km² to its control. Russian commentators are already doubting that Moscow can reach the two cities.

Russia's years-long push on the Fortress Belt, the chain of cities anchoring Ukraine's defense in Donetsk Oblast, has been stalling since Vivaldi began. Unable to take those cities, Russia keeps hitting them from the air. On 8 October, a Russian bomb killed 30 people on two buses in Kramatorsk.

Across the Siverskyi Donets

Russian milbloggers said Ukrainian forces liberated Ozerne and advanced east of Pyskunivka toward Kryva Luka, ISW reported. They also acknowledged that Ukrainian troops drove Russian forces out of Pyskunivka. Ukrainians are now counterattacking toward Kryva Luka from the west and northwest, from across the river.

ISW called the repeated Russian claims of a river crossing notable, because the Siverskyi Donets is a significant natural obstacle. Kryva Luka is a dominant height just south of the river. From there, Ukraine could launch further counterattacks. Ukrainian forces appear to have pushed Russian troops off both banks in this area, ISW assessed.

The heights Russia wanted

After Vivaldi cleared ground near Lyman in September, Russia shifted its push south toward Mykolaivka and Sloviansk. Russian forces likely see Mykolaivka, just east of Sloviansk, as a primary objective, ISW said. Its heights would favor an offensive on the city. Ukrainian pushes northeast and southeast of the town now deny Russia that terrain.

East of Kramatorsk, milbloggers claimed Ukrainians liberated Malynivka and advanced between Fedorivka Druha and Holubivka. They also reported gains into southern Minkivka and near Fedorivka. The lines remain tangled. Geolocated footage shows Ukrainian forces striking a Russian position in central Tykhonivka after what ISW assesses was a Russian infiltration.

ISW said the counterattacks may point to a broader Ukrainian goal: pushing Russian forces east, away from the Sloviansk–Kramatorsk area and toward the Siverskyi Donets–Donbas Canal.

The Vivaldi playbook

The counterattacks have run for weeks. On 29 September, Ukrainian military observer Kostiantyn Mashovets reported them in the same areas, saying Russia's 3rd Combined Arms Army had failed to make significant gains. ISW assesses that the attacks build on months of shaping meant to wear down Russia's offensive capacity.

Before Vivaldi, Ukrainian forces targeted Russian drone operators, gaining drone superiority before the counteroffensive. They used the same approach ahead of their Oleksandrivka counterattacks in early 2026.

Moscow appears to see the pattern. A Ukrainian military official said on 7 October that Russia is moving drone units and Spetsnaz from quieter sectors to the Sloviansk–Kramatorsk direction. Ukraine also reorganized its command in and around Donetsk Oblast in early September, which may be blunting Russian attacks from the east, ISW said.

"Distant" and "doomed"

One Russian milblogger called an advance toward the Sloviansk–Kramatorsk area a "distant" prospect, ISW reported. A Russian offensive from Siversk toward Sloviansk may be "doomed" to failure or heavy losses unless Russia retakes the forests south of Lyman, he said.

The counterattacks east of the two cities appear to support Vivaldi, ISW assessed. Together with Russia's defeat north of the river, they could disrupt Russia's offensive toward Sloviansk from the east entirely.

If Ukraine holds Kryva Luka and keeps Russia off the Mykolaivka heights, Moscow's pincer on Sloviansk and Kramatorsk loses the ground it was built on.

Russian forces struck the eastern Ukrainian city of Kramatorsk on the morning of 8 October, hitting two route buses carrying residents and killing dozens of civilians. The Donetsk Oblast prosecutor's office opened a war-crimes investigation.

Russia has turned everyday movement in frontline Donetsk Oblast into a lethal risk, striking city buses, ambulances, and cars in places its army has not been able to capture.

A route bus run turned deadly

The attack came at around 10:00, catching two route buses in the impact zone. The prosecutor's office said the attackers likely used a UMPB D-30SN. HUR, Ukraine's military intelligence, describes it as a guided glide bomb that can fly up to 100 km when released from an altitude of 12–15 km and carries a warhead equal to a FAB-250 aerial bomb.

30 people were killed and 18 injured after a Russian bomb hit two passenger buses carrying civilians in Kramatorsk, Donetsk Oblast.

The buses caught fire, and the force of the attack also damaged nearby homes and cars. Some victims were so badly burned that police had to recover… pic.twitter.com/FqLdM0HN1B

— Euromaidan Press (@EuromaidanPress) October 8, 2026

The toll rose through the day, from 12 dead in the first reports to 30 killed and 20 wounded by 14:55, Donetsk Oblast head Vadym Filashkin said. Across Donetsk Oblast, Russian attacks killed 33 people that day, including the 30 in Kramatorsk and three in nearby Bilenke, the State Emergency Service said. Ukrainian President Volodymyr Zelenskyy said the strike would not go unanswered.

Buses pulled off the roads

Filashkin ordered the Kramatorsk and Sloviansk city military administrations to suspend public transport, citing the sharp deterioration in security. Buses had become an attractive target for Russian forces, he said, and the authorities could not risk the lives of passengers and drivers. He also urged everyone still in Donetsk Oblast to leave for safer parts of Ukraine. Kramatorsk is a frequent target of Russian attacks. Russia had not commented on the strike as of publication.

The city has been under daily fire. On 5 October, Russian FPV drones hit ambulances and an apartment block in Kramatorsk, killing a woman and wounding four, the prosecutor's office reported. Over the previous day, Russian forces shelled Donetsk Oblast settlements 31 times and 256 people left the front line, Filashkin said.

At least 30 people have been killed and 18 injured after Russian forces struck two passenger buses in Kramatorsk, eastern Ukraine, on Thursday morning, according to updated figures released by Ukrainian prosecutors. The attack comes amid continuing Russian strikes on Ukrainian cities.

Russian forces attacked Kramatorsk, in Ukraine’s Donetsk region, at approximately 10am local time on 8 October, hitting an area where two scheduled passenger buses were carrying civilians.

The Donetsk Regional Prosecutor’s Office initially reported 12 fatalities and 14 injuries. In a subsequent update, prosecutors raised the death toll to 30 and the number of injured to 18.

The attack was also confirmed by the Kramatorsk City Council and Vadym Filashkin, head of the Donetsk Regional Military Administration.

According to preliminary findings from Ukrainian investigators, Russian forces may have used a UMPB D-30SN guided aerial munition. The precise weapon and circumstances of the attack remain under investigation.

Passenger buses caught in Russian bombardment

The two buses were operating regular passenger services when the strike occurred. Ukrainian authorities said passengers were on board, although detailed information about the victims, including their ages and identities, has not yet been released.

Photographs published by the regional prosecutor’s office show the aftermath of the attack, including severely damaged passenger vehicles. Emergency personnel and law enforcement officers were dispatched to assist the wounded, recover victims and document evidence.

The strike raises questions about the selection of the target and precautions taken to protect civilians. Under international humanitarian law, civilian vehicles and their passengers are protected from deliberate attack unless a vehicle becomes a military objective under the applicable legal rules.

The circumstances of Thursday’s strike, including whether the buses were directly targeted or struck during an attack on another location, have not yet been independently established.

Kramatorsk under increasing pressure

Kramatorsk remains one of Ukraine’s principal administrative and logistical centres in the part of Donetsk region still controlled by Kyiv. The city has faced repeated Russian bombardments as Moscow continues its military campaign to capture the remaining Ukrainian-held territory in Donetsk.

Its transport infrastructure serves residents who have remained despite years of fighting, including those travelling between neighbouring communities and those attempting to leave the region.

Regional officials have repeatedly urged residents to evacuate to safer areas of Ukraine as Russian bombardments continue. However, civilians remain in Kramatorsk and surrounding settlements, where everyday services, including public transport, continue to operate despite the danger.

Guided bombs and civilian protection

Russian forces have used guided aerial bombs against Ukrainian-controlled settlements near the front line. Such weapons can be released from aircraft at distances that reduce Russian pilots’ exposure to Ukrainian air defences.

The UMPB D-30SN, provisionally identified in the Kramatorsk attack, is a guided munition designed to reach targets beyond the immediate position of the launching aircraft. Its suspected use against an area containing occupied passenger buses will form part of the investigation.

Investigators will need to establish the intended target, the weapon used and the information available to those who planned and carried out the strike. These findings are relevant to determining whether the attack violated the laws of war.

Investigators examine civilian deaths

The Donetsk Regional Prosecutor’s Office is collecting evidence concerning the bombardment, including the type of munition used and the circumstances in which the buses were struck.

Establishing whether the vehicles were deliberately targeted, or whether the attack resulted from an indiscriminate or disproportionate strike, will be central to any assessment under international humanitarian law.

The identities of the victims and the full extent of the damage have yet to be established publicly. As of the updated figures issued by Ukrainian prosecutors on 8 October, 30 people were reported killed and 18 injured.