Ukraine's Defense Forces advanced more than 15 km through underground utility tunnels into Russia's rear on the Kupiansk axis in Kharkiv Oblast, the Khartiia Corps of Ukraine's National Guard reported on 22 October. The corps called it Operation Veles. The underground advance was paired with attacks on the surface and drone strikes, hitting Russian forces from two directions, the corps told Militarnyi.

Russian troops have repeatedly crawled through gas pipelines around Kupiansk to get behind Ukrainian lines, even after Ukraine reported confident control of the city in February. This time, Ukraine went underground itself. The operation took away Russia's chance to get into Kupiansk's rear, the corps said.

The corps reported more than 30 Russian soldiers captured and Russian losses of more than 100. Militarnyi, citing the unit, put the number of Russian troops killed at over 100.

Khartiia studied how Russian troops moved through pipes before going underground itself, the corps commander, Brigadier General Ihor Obolenskyi, said.

"We watched how the enemy works underground and studied how they do it. The Russians intended to use gas pipelines to get into the rear of our troops. So we went underground ourselves. We anticipated the enemy's actions and mastered the tactics of underground combat," he said.

Boots under ground!

Asymmetric breakthrough in the Kharkiv Region: Khartiia Corps conducts the subterranean counteroffensive Operation VELES, advancing 15 km underground.

Corps Commander General Ihor Obolenskyi explains a unique operation. pic.twitter.com/qRQ93kckpK

— Khartiia Corps in English (@khartiia_eng) October 22, 2026

For the operation, troops trained physically and psychologically to fight in confined spaces, sappers and engineers prepared the underground route, and special communications, navigation, silent logistics, and life-support systems were put in place, Khartiia told Militarnyi. The operation was named after Veles, the Slavic pagan god of the underworld.

Khartiia's brigade, the R.U.H. assault regiment, the Lava drone regiment, the Achilles drone brigade, and units of Ukraine's military intelligence, including the Freedom of Russia Legion and the Russian Volunteer Corps, took part, the corps said.

Russia has used pipelines to infiltrate before

By September 2025, Russian forces had used pipelines to move troops behind Ukrainian lines three times, Ukrainian monitoring project DeepState reported on 12 September 2025. The first was in Avdiivka, the second near Sudzha, and the third near Kupiansk, where groups crossed the Oskil River through a gas pipe.

Near Sudzha in March 2025, Russian special forces walked through a pipeline that until recently had carried Russian gas to Europe, the Associated Press reported. A pro-Kremlin blogger claimed they covered about 15 km and that some spent several days inside.

Russian troops kept using the pipeline near Kupiansk this year. On 27 September, Khartiia's reconnaissance drones recorded Russian forces leading nine civilians, including children, elderly people, and a person on crutches, through the gas pipeline out of the Kupiansk community. Men of military age in civilian clothes walked alongside them, and the corps believes they were Russian soldiers using the group as cover to withdraw. Ukrainian troops held fire because of the civilians, the corps said, adding that the case has been documented for a war crimes investigation.

Why the war is moving underground

Drones, constant surveillance, and AI-assisted targeting have made the battlefield surface transparent and deadly, argue John Spencer, chair of urban warfare studies at West Point's Modern War Institute, and Col. Drew Craig, principal military engineering staff officer at NATO's Allied Rapid Reaction Corps. In an August analysis, they write that soldiers in Ukraine describe a "death zone" of some 30 km, where moving above ground can draw an attack within minutes. When firepower makes the surface too dangerous, armies have historically gone underground, as they did in World War I and Vietnam, and more recently in Gaza and Lebanon.

"Armies that cannot survive above ground must adapt below it," the authors write.

Fighting in tunnels brings its own requirements, the authors write: detecting the enemy by sound and vibration, and specialized unmanned systems that cannot rely on GPS or stable radio links. Long stretches underground also take a severe psychological and physical toll on soldiers.

Western militaries are not ready for this, Spencer and Craig write. No NATO partner maintains even general capabilities for large-scale underground warfare, and US and British efforts focused mainly on detecting and clearing tunnels rather than occupying and operating in them.

Russian forces are preparing to resume mechanized assaults in southern Ukraine after a pause of several months and are moving armored vehicles toward areas where they plan to launch offensives, Anastasiia Shevchenko, deputy spokesperson for the Southern Forces Grouping, told Ukrinform on 22 October. The Huliaipole axis remains the hottest in the Southern grouping’s zone, with 10 to 20 combat engagements reported on an average day, she said.

On the Huliaipole axis, one of Russia’s largest force groupings is fighting Ukrainian forces, comprising units from several Russian combined-arms armies, the spokesperson says. Over the past week, as the weather worsened, Russian forces began local assaults there with infantry, motorcycles, and armored vehicles, seeking to break through toward Zaporizhzhia and blockade the city, Ukraine’s 7th Air Assault Corps reported, adding that the area is one of Russia’s key priorities in southern Ukraine. Russia has used fog this way before: last November, Russian troops moved under its cover to avoid detection by Ukrainian drones as they advanced on Huliaipole, the Institute for the Study of War assessed.

Russian forces have abandoned large-scale assaults across a broad front and are attempting to infiltrate Ukrainian positions in small groups. They periodically use motorcycles and quad bikes for assaults, Shevchenko said, adding that these vehicles are fast and maneuverable.

However, Russian forces should not expect to advance unimpeded, the spokesperson noted. Ukrainian units control Russian supply routes and systematically detect and strike Russian personnel and equipment while they are still moving toward their launch positions, she added.

“Specifically, speaking in numbers, since the beginning of October alone, units of the Southern Forces Grouping (Forces) have destroyed more than 3,000 occupiers and 1,300 pieces of weapons and military equipment. Thus, the enemy is suffering significant losses in the operational zone of the Southern Forces Grouping (Forces),” the spokesperson concluded.

Ukrainian drones disrupt Russian logistics

Russian forces had stopped using military vehicles because Ukraine’s unmanned systems forces controlled their logistics, Shevchenko said in comments to Ukrinform on 16 September. Ukrainian drones spotted Russian troops and equipment in time and struck them mostly on their routes of advance, she said.

Ukrainian air strikes destroyed bridges near Polohy in Zaporizhzhia Oblast, complicating Russian supply operations along the Huliaipole axis, Ukraine’s 7th Air Assault Corps reported on 21 September. Russian forces had used these bridges to move personnel, heavy equipment, and ammunition for their offensive toward Orikhiv. Disruptions to logistics have forced Russian units to rely more on motorcycles, which are more vulnerable to Ukrainian strikes, the corps said.

Russian forces are also expected to use fog and rain as cover for assaults, Mykola Zinko, deputy commander of the unmanned systems battalion of the 5th Assault Brigade, said on 19 October. Russia has brought up reserves, and its heavy equipment will move out under the fog, he said.

During an expedition from 2 to 16 October in the Polish village of Łasków, a Ukrainian team uncovered the remains of more than 40 Ukrainians, including women, men, and children, the Ukrainian Institute of National Memory, which commissioned the search, said on 20 October.

Ukraine and Poland disagree over how to interpret their shared history. One of the most contentious issues is the Volhynia tragedy, a series of massacres of Polish and Ukrainian civilians during World War II, the largest of which took place in Volhynia. Amid unresolved disputes over this history, Ukraine halted Polish search and exhumation work on its territory. Both sides have since resumed the work, and Łasków is the first Ukrainian search in Poland to find remains since 2016, the institute said.

During Poland’s 2025 presidential campaign, Karol Nawrocki said that unresolved historical issues could stand in the way of Ukraine's accession to the EU and NATO. The dispute is still live: on 20 October, Polish Defense Minister Władysław Kosiniak-Kamysz called on Kyiv to distance itself from the Lviv Oblast Council’s decision to declare 2027 the year of the UPA and Shukhevych. The searches, meanwhile, continue on both sides of the border.

More than 300 Ukrainians were killed in Łasków

On the final day of the investigation, specialists partially uncovered a mass grave containing the remains of eight people and documented all the findings. The victims’ ages, sexes, and causes of death will be established during exhumation work planned for spring 2027.

“According to witness accounts, a large number of the Ukrainian victims were buried—or, in fact, simply covered with a thin layer of soil—in hiding places, fields, and the yards of their own homes in the village of Łasków. They were buried only 10 days later by Ukrainians from the neighboring village of Smolihiv, who were then also killed and shot near the forest,” director of the Dolia memorial search center Sviatoslav Sheremeta said, according to Istorychna Pravda.

The Ukrainians were killed in an attack by units of the Polish Home Army (Armia Krajowa) and the Peasants’ Battalions (Bataliony Chłopskie), the institute said when the search began.

“Most of the graves are located at a depth of 40–70 centimeters from the ground surface,” Sheremeta said.

Historical records indicate that more than 300 people were killed in the Polish village of Łasków on 10 March 1944, the media outlet reported. Ukrainian and Polish historians and experts have identified 327 village residents who were killed, although some researchers estimate the death toll at around 350, the report said. Further historical research and search operations may help establish the final number of victims.

Ukraine imposed a ban on exhumations but allowed the work to resume several years later

In response to the widespread destruction of Ukrainian monuments in Poland between 2015 and 2017, and what the Ukrainian side considered an inadequate investigation into these incidents, Ukraine imposed a moratorium on search operations and the exhumation of Poles killed by Ukrainian Insurgent Army (UPA) fighters in 1943–1945, Ukrainska Pravda reported.

In January 2025, Polish Prime Minister Donald Tusk announced a “breakthrough,” saying there was a decision on the first exhumations of Polish victims of the UPA.

By April 2025, exhumations of Polish residents killed in 1945 had begun in Ukraine’s Ternopil Oblast. A joint Polish-Ukrainian team of experts took part in the work.

Searches in Ukraine have found mostly Polish soldiers from 1939, while Ukraine waits for permits in Poland

Most of the Polish remains recovered in Ukraine since the moratorium ended belong to soldiers killed fighting the Germans in September 1939, not to victims of the Volhynia killings. In Lviv, searchers exhumed at least 31 soldiers at Zboiska in 2025 and found 113 more at Holosko this autumn.

Of the 1943–1945 victims, joint Polish-Ukrainian teams have recovered 42 in Puzhnyky, Ternopil Oblast, which were reburied in September 2025, and 55 in Ostrówki and Wola Ostrowiecka in Volyn Oblast, which they found this summer. Polish historians attribute the Puzhnyky killings to a UPA unit. Ukraine’s Institute of National Memory first described the dead as victims of Soviet repression, then changed the wording to victims who died in 1945 after Poland’s Foreign Ministry objected. A search in Uhly, Rivne Oblast, this spring found no mass grave.

Ukraine’s first search in Poland in years, for UPA fighters in Jureczkowa in autumn 2025, found no remains. The Ukrainian team waited more than a year for permission to work in Łasków, which came on 31 August. Its requests for Sahryń, where Home Army units killed between 200 and 800 people on the same day, according to PAP, and for Przemyśl were still pending in July, with Poland’s Institute of National Remembrance asking for more documents.

The history row reaches the search permits

Kyiv has said it will keep issuing permits for Polish searches despite the tensions. In August, before the Łasków permit came through, Ukraine’s ambassador to Poland, Vasyl Bodnar, said Ukraine could not get a single permit to search for its dead in Poland while it kept approving Polish work in Ukraine.

Meanwhile, Warsaw has kept raising the stakes over how Ukraine remembers the UPA. Nawrocki stripped President Volodymyr Zelenskyy of Poland’s Order of the White Eagle in June after Zelenskyy named a military unit after the “Heroes of the UPA.” In July, the head of Nawrocki’s chancellery, Zbigniew Bogucki, spoke in the Sejm of genocide “in Volhynia and Eastern Lesser Poland,” using the interwar Polish name for what is now western Ukraine. In August, Deputy Foreign Minister Marcin Bosacki warned that placing Stepan Bandera or Roman Shukhevych in Ukraine’s National Pantheon would damage relations with Poland and Europe.

Nawrocki has also sent the Sejm a bill that would punish promoting the ideology of the OUN and the UPA, which had its first reading on 3 July. Polish members of the European Parliament proposed adding the Volhynia tragedy and the UPA to the parliament’s report on Ukraine’s progress toward EU membership.

The two sides also disagree on the numbers the exhumations are meant to help settle. Polish estimates put the number of Poles killed in Volhynia and Eastern Galicia at about 100,000. Ukraine’s Institute of National Memory counts about 30,000 Polish and 10,000 Ukrainian victims identified so far.

Fighters of the Bratstvo Battalion, part of the Timur Special Unit of Ukraine’s military intelligence agency (HUR), captured three Russian servicemen and gave first aid to one of them, HUR reported on 19 October. They also found and destroyed Russian sabotage groups, HUR said, adding that counter-sabotage operations in the Zaporizhzhia direction are ongoing.

Russian forces have spent months trying to get closer to Zaporizhzhia, one of Ukraine’s largest cities. They may try to use the dried-up bed of the Kakhovka Reservoir to infiltrate north toward it as autumn fog and dense vegetation set in, the Institute for the Study of War reported on 26 September. Ukrainian troops are now clearing the area of Russian saboteurs trying to get into the rear of Ukrainian positions, according to HUR.

HUR’s video shows the fighting and the captures, with one dead Russian soldier blurred. At the end, a captured Russian says two of the three men in his group were killed by a “Baba Yaga,” the nickname Russian troops use for Ukraine’s heavy bomber drones.

HUR described what the Russian groups are trying to do:

“Using small sabotage groups, the enemy is attempting to penetrate deep into the rear positions of Ukraine’s Defense Forces, build up forces to destabilize the situation, disrupt logistics, and neutralize Ukrainian defenders’ combat crews.”

Russia seeks to bring the front closer to Zaporizhzhia

Russia’s objective in the Zaporizhzhia direction is to advance within artillery range of the city, hold forward positions, and protect its rear from Ukrainian strikes, the Institute for the Study of War noted.

In January, Russian forces were trying to capture Stepnohirsk and advance along the shore of the former Kakhovka Reservoir toward Zaporizhzhia. Taking the settlement would let Russian troops place long-range artillery or fiber-optic drones there to strike the city’s outskirts, Southern Defense Forces spokesperson Vladyslav Voloshyn told Ukrinform on 14 January.

On 22 September, Anastasiia Shevchenko, spokesperson for the Southern Forces Group, said there were no signs of preparations for a direct offensive on Zaporizhzhia and that Russian forces lacked the troops and means to advance directly toward the city.

Dense vegetation and limited visibility: combat on the reservoir bed

The Kakhovka Reservoir was a vast artificial body of water on the Dnipro River in southern Ukraine that supplied water to millions of people, as well as to agriculture and industry. On 6 June 2023, Russian forces blew up the Kakhovka Hydroelectric Power Plant, the Southern Operational Command reported.

After the dam was destroyed, the bed of the former reservoir quickly became overgrown with willows, poplars, and shrubs, creating a new battlefield. Ukrainian troops have fought there before.

In November 2025, fighters from the same Bratstvo unit carried out a reconnaissance and sabotage operation 7 kilometers from the shoreline of the former reservoir, HUR said. They found and eliminated Russian troops, then raised the Ukrainian flag over the islands there and took control of the area.

In April, the Bratstvo unit’s chief of staff, who goes by the call sign “Dyviziia,” described the conditions on an earlier raid across the reservoir bed:

“You’re just constantly moving through these thickets, with no way to figure out which direction to go. You can literally see everything just two meters ahead of you.”

Six people were killed in a Russian strike in the settlement of Nova Vodolaha in Kharkiv Oblast, including girls aged 1 and 11. Another 15 people were injured, including seven children, Kharkiv Oblast Governor Oleh Syniehubov said on 20 October. Russian forces struck a park with a drone while families with children were there, Ukraine’s Minister of Internal Affairs Ivan Vyhivskyi said.

Russian forces continue to attack Ukrainian cities, killing civilians and destroying civilian infrastructure. The Kharkiv Oblast Prosecutor’s Office has opened a war-crime investigation into the strike. The strike was aimed at people, Yurii Yurchenko, head of a police department in Kharkiv Oblast, said in a comment to Suspilne.

The 14-month-old girl was named Anhelina

The Russian drone circled the park several times before crashing, Yurchenko said. He said the drone struck a tree near a café, and the blast wave and shrapnel hit people at the establishment. The attack came at around 16:30, the prosecutor’s office said, adding that Russian forces had preliminarily used a Geran-3 drone.

The Russian strike killed three women, aged 28, 34 and 36, a man around 40 years old, and two girls, aged 14 months and 11 years, Syniehubov said in his statement.

The youngest girl, named Anhelina, was born in August 2025, Ukrainian President Volodymyr Zelenskyy said. Her mother, Inna, died in the hospital, he added.

Zelenskyy shows US senators photos of the aftermath the same day

Zelenskyy met with US Senators Richard Blumenthal and Thom Tillis, along with their colleagues from both parties and both chambers of Congress, according to a 19 October post on his social media accounts. During the meeting, he discussed the Russian attack in Kharkiv Oblast and showed lawmakers photographs from the scene, including one of the infant who was killed in a stroller.

“This is how Russia responds to the lifting of sanctions and the easing of pressure,” he said in the post.

Zelenskyy said Ukraine needs air defense and that no one should think about making money with Russia while it continues its war. He asked that sanctions on Russia stay in place until the killing stops, urged the US to “be strong” and apply Lindsey Graham’s law, and called on Europe to keep supporting Ukraine.

Ukrainian forces have liberated more territory since the beginning of the fall than Russian troops have captured during the same period. This trend has persisted throughout 2026, Ukrainian President Volodymyr Zelenskyy said in his 18 October address. He also reported that Dobropillia, Kostiantynivka, and five other settlements remain under Ukrainian control.

Russia systematically exaggerates its battlefield gains. A recent briefing by Valery Gerasimov, chief of the General Staff of the Russian Armed Forces, in which he claimed that Russian forces had captured 92 settlements since the beginning of September, as well as Kostiantynivka and Dobropillia, and advanced to within 5 kilometers of Zaporizhzhia, was based on “outright lies, manipulation, and exaggerations,” Ukrainian General Staff spokesperson Andrii Kovaliov said.

Ukraine also continues to defend areas near Kramatorsk, Zelenskyy said. He dismissed Russian claims about Zaporizhzhia.

“We are destroying Russians 20 kilometers from Zaporizhzhia, not five, as someone in Russia is fantasizing to Putin,” Zelenskyy said.

Ukrainian forces continue to hold back Russian assaults and destroy groups of occupying troops attempting to infiltrate Dobropillia, the president said. The Defense Forces are also defending positions elsewhere in Donetsk Oblast and in Kharkiv and Zaporizhzhia oblasts.

Zaporizhzhia axis: Russians seek to move artillery closer to the city

Russia seeks to advance on the Zaporizhzhia axis to bring the regional capital within range of its tube artillery, hold forward positions, and protect rear areas from Ukrainian strikes, the Institute for the Study of War (ISW) said on 18 October.

Maksym Kravchuk, spokesperson for Ukraine's Southern Group of Forces, refuted Gerasimov’s claims that Russian forces had captured Malokaterynivka, located south of Zaporizhzhia, stressing that the settlement remains under Ukrainian control, the Center for Countering Disinformation said on 18 October. Ukrainian troops recorded a video directly from Malokaterynivka to confirm this.

As of 18 October, Russian forces had advanced or infiltrated to within 24 kilometers of Zaporizhzhia, ISW said.

Dobropillia remains under Ukrainian control despite Russian assaults

Dobropillia is now a fortress anchoring Ukrainian positions along the highway leading northeast toward Kramatorsk. Russia first tried to take Dobropillia in August 2025 and is now trying again.

Russia is redeploying reinforcements to the Dobropillia axis and continues to send assault infantry through the village of Nove Shakhove despite heavy losses. Russian command will likely try to encircle or at least envelop Dobropillia and cut off Ukrainian supply routes from the direction of Bilozerske, Ukrainian military analyst Kostiantyn Mashovets wrote on 9 October.

Mashovets sees the push as the southern flank of a Russian effort to envelop the whole Sloviansk–Kramatorsk urban area.

Dobropillia remains under Ukrainian control, Zelenskyy said. On 18 October, footage located by analysts showed a Russian soldier hoisting a flag in the town's southeast after an infiltration, yet ISW has found no sign that Russian troops have dug in there.

Russia claimed to have captured Kostiantynivka, but ISW found no evidence

Ukrainian troops in and around Kostiantynivka are stopping Russia from locking in its gains in the city or pushing on toward Druzhkivka and Kramatorsk, ISW said on 17 October.

Russian officials claimed that capturing Kostiantynivka was an important step toward establishing control over the Sloviansk–Druzhkivka–Kramatorsk urban agglomeration and the entire Donetsk Oblast, ISW said in August. The Kremlin also claimed that Russian forces had captured the city as early as 5 July, the institute added.

A Russian military blogger claimed that Russian forces had full control over Kostiantynivka, but ISW found no evidence to support this claim, the institute said in its 16 October assessment. Russian troops had only infiltrated parts of southern and central Kostiantynivka without consolidating positions, and there was no evidence of their presence in its northern part, ISW added.