Ukrainian assault troops suffered more than 10 times fewer casualties than Russian forces during Operation Vivaldi, a Ukrainian military veteran said on 9 October, describing the ratio as unprecedented and highlighting Ukraine’s improved ability to protect its soldiers during offensive operations.

The counteroffensive has been a significant Ukrainian success, reclaiming territory in northern Donetsk Oblast and disrupting Russia’s plans to advance toward Sloviansk and Kramatorsk. The reported casualty ratio points shows Ukraine’s ability to make offensive gains while reducing the human cost of assaulting fortified positions.

Yevhen Dykyi made the remarks in an interview with Radio NV, saying the results showed how Ukrainian forces had learned to limit losses while attacking defended Russian positions.

Protecting troops during offensive operations

Dykyi said the casualty ratio was one of the operation’s most important outcomes.

He said that Ukrainian assault troops suffered more than 10 times fewer casualties than Russian forces during the counteroffensive.

“That speaks volumes. We have learned how to protect our people, and that is extraordinarily vital,” he added.

Operation Vivaldi disrupted Russia’s advance in Donetsk

The Third Army Corps launched Vivaldi in mid-September in northern Donetsk Oblast, near Lyman, where Russian forces had spent months trying to advance toward Ukraine’s fortified cities of Sloviansk and Kramatorsk.

The operation aimed to clear Russian troops from positions north of Lyman and disrupt Moscow’s plans to encircle the remaining Ukrainian-held parts of Donetsk Oblast. Ukraine’s Third Army Corps announced the counteroffensive on 15 September, initially reporting that its forces had cleared Russian infiltrators from several settlements and liberated Serednie.

By 30 September, Ukraine had regained 176 square kilometers of territory during the operation, according to figures cited by the Ukrainian presidential office. Ukrainian authorities also reported that their forces had captured around 250 Russian soldiers and inflicted more than 5,000 Russian casualties, including killed and wounded. 

The counteroffensive also disrupted Russia’s effort to advance behind Ukraine’s fortified defensive line. By threatening Russian positions north of Lyman, Ukrainian forces complicated Moscow’s plans to encircle the Sloviansk-Kramatorsk area rather than attack its defenses head-on.

Unmanned systems help limit casualties

A key feature of Vivaldi has been the use of unmanned systems to attack fortified Russian positions before Ukrainian infantry moves in. Ukrainian forces deployed ground robots carrying grenade launchers to fire into Russian shelters, while explosive ground vehicles were used to destroy bunkers and strongpoints.

In one reported tactic, heavy drones delivered kamikaze ground robots more than 10 kilometers behind Russian lines, allowing Ukrainian operators to attack positions without exposing infantry to direct fire.

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.

Ukraine's 413th Separate Raid Regiment of the Unmanned Systems Forces struck the Snizhne Machine-Building Plant in occupied Donetsk Oblast in September, working with other Defense Forces units, the regiment posted on 6 October, sharing a video of the strike. The General Staff reported the strike on the plant on 11 September, saying that the extent of the damage was being clarified.

The strike adds to Ukraine's campaign of long-range attacks on Russian military targets as Russia has begun its winter campaign of strikes against Ukraine's energy infrastructure. Hitting the suppliers of aircraft parts goes after Russia's ability to keep its attack jets and helicopters flying.

The regiment said the plant works for Russia's military industry, producing engine components for attack aircraft and combat helicopters.

A former Motor Sich plant in occupied Snizhne

The Snizhne plant was a separate division of Motor Sich, a Ukrainian aircraft-engine maker based in Zaporizhzhia, a city that remains under Ukrainian control. Snizhne has been under Russian occupation since 2014. The plant specializes in producing parts for gas-turbine engines, including compressor and turbine discs and blades, the General Staff said. It never built whole engines. In September 2014, months into the occupation, it was machining blanks from Motor Sich's Zaporizhzhia plant into turbine blades and was one of only two plants in the former Soviet Union making such blades for helicopters, a plant worker said.

Motor Sich said in December 2017 that it had lost control of the plant. Weeks later, Viacheslav Bohuslaiev, then Motor Sich's honorary president and a member of parliament, told RFE/RL's Donbas.Realii that Motor Sich still owned the plant and had handed its management to a foreign company, while keeping it under the company's "full control."

In February 2023, Ukraine's Prosecutor General's Office served Bohuslaiev a notice of suspicion of aiding a terrorist organization, alleging that Motor Sich shipped blanks to the Snizhne plant and received finished engine parts through foreign-registered companies. The case went to court in October 2023, and Bohuslaiev, who denies the charges, has been in pretrial detention since October 2022 as the trial continues.

Snizhne, which Russia uses as a rear base, has been hit before. In May, Ukraine's Unmanned Systems Forces and the Security Service of Ukraine struck a Russian training center for drone pilots in the city, and in September, a strike on energy infrastructure cut power across Snizhne.