In August, Russian gains ticked upward in key sectors along the 1,200-km front line of Russia's 55-month wider war on Ukraine.

The coming winter could slow Russian advances as the trees lose their leaves and infantry infiltrators have nothing to conceal them from overhead drones. But for the next month or two, the trees will still have their leaves, and the infiltrators will still have their cover.

And that means, as fall wears into winter, Ukraine may lose yet more ground in the north and especially in Donbas region in the east, where Russia enjoys a substantial manpower and firepower advantage. "Russian forces still hold the operational initiative and are slowly capturing ... Donetsk Oblast as well as border zones in Sumy and Kharkiv Oblasts," mapper Thorkill warned.

The Russian gains belie a greater truth, however. In the middle of the fifth year of wider war, the situation on the ground only changes along the margins even as thousands die.

According to Thorkill's tally, the Russians occupied just under 220 square km of Ukrainian soil in August. That's 25% more territory than they captured in July. "The situation has deteriorated sharply in the Donbas in August," mapper Clément Molin explained.

To be fair, the Russians are advancing much more slowly than they did a year ago. "Compared to August 2025, Russian gains are down by nearly half," Molin noted. That's cold comfort to Ukrainian civilians and defenders in the areas where the Russians are still gaining ground, however. And the sheer proximity of the most aggressive Russian formations to the most vulnerable Ukrainian settlements means it might not take much more effort on the part of the Russians to turn these settlements into battlegrounds.

The Russians' main effort is still directed at the last big free cities in Donetsk. Inching forward at great cost from several directions, Russian forces are slowly closing a pincer around Kramatorsk and Sloviansk and the tens of thousands of civilians who still live in the adjacent cities.

Thorkill's map places the forwardmost Russian forces in Mykolaivka, just 4 km east of Sloviansk. This is the middle joint of the Russian pincer. The pincer's southern claw is a zone of disputed control stretching along the road between the ruins of the city of Kostiantynivka and the battleground town of Oleksiievo-Druzhkivka.

If the Russians can march through Oleksiievo-Druzhkivka, they can lay siege to the town of Druzhkivka, a few kilometers to the northwest. If they can capture Druzhkivka, they can turn north and assault Kramatorsk, a mere 6 km away.

Ukrainian counterattacks

The most fragile part of the claw is to the north. Bucking the overall trend of Russian gains in August, Ukrainian forces counterattacked in several sectors the same month. Most dramatically, a clutch of Ukrainian mechanized and air assault brigades extended a slow advance through the town of Nove, mostly cutting across a 100-square-km salient of Russian forces around 25 km northeast of Sloviansk.

The Nove counterattacks offer some hope that targeted Ukrainian action may slow the Russian march on Sloviansk and Kramatorsk from the north. Meanwhile, a reshuffling of Ukrainian units south of Kramatorsk could improve Ukrainian defenses against an assault on the twin cities from the south.

As new Ukrainian commander-in-chief Gen. Mykhailo Drapatyi gradually addresses some of the imbalances in the Ukrainian ground forces, certain key units are getting help. Most notably, the 425th Assault Regiment is now subordinate to the 1st Azov Corps, which is responsible for the defense of Kramatorsk.

Keenly aware that the Russians intend to slowly infiltrate front-line settlements with small teams of infantry rather than rushing them with masses of easily-droned armored vehicles, the 1st Azov Corps has assigned the aggressive 425th Assault Regiment "to clear enemy infiltrators from the brigades’ areas of defense," the corps stated.

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Infiltrators aren't the only problem, however. The Russians' favorite tactic combines small teams of infantry with massive aerial firepower in the form of precision-guided KAB glide bombs flung by supersonic Sukhoi Su-34 fighter bombers.

"Glide bombs hurt," Ukraine's 4th National Guard Brigade reported. "It's about 200 kg of explosives flying your way. And you can't really shoot them down like you can shoot down drones. They can collapse fortified buildings, bunkers, and entire urban blocks much more effectively than artillery."

After the dust settles from the glide bomb impacts, Russian infantry "infiltrate through the damaged areas, using the ruins for cover and concealment," the national guard brigade explained.

The same lack of long-range air defenses that exposes Ukrainian cities to relentless Russian bombardment also deprives front-line forces of protection from the Su-34s and their glide bombs. And so the Russians can keep bombing and keep infiltrating as long as the trees offer some concealment for the infantry.

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Ukraine’s secret counteroffensive takes the pressure off Sloviansk

The clock is ticking. The Russians will aim to position their forces for more direct assaults on Kramatorsk and Sloviansk no later than next year. The Ukrainians will aim to slow down the Russians, trading a little space for more time. Time Drapatyi may use to institute further reforms in the Ukrainian ground forces.

Zooming out and taking the long view, no one should expect major changes on the map of Russia's wider war as the fifth year of fighting grinds toward the sixth. Yes, the last two big free cities in the Donbas are in trouble. But "the overall situation remains unchanged since October 2023," Thorkill wrote.

The Russians slowly advance. The Ukrainians slowly fall back. And losses deepen on both sides.

Ukraine secret eastern counteroffensive seems to have been even more successful than some observers reported. It's possible that, in the sector just north of the town of Lyman in eastern Ukraine's Donetsk Oblast, the Ukrainian 3rd Army Corps is just a few kilometers short of encircling two Russian regiments.

That doesn't mean the Russian units can't escape. After all, there isn't a contiguous line of Ukrainian forces—nor a contiguous line of Russian forces for that matter—anywhere along the 1,200-km disputed gray zone that threads across eastern and southern Ukraine.

But the closing pincer around elements of the Russian 2nd and 144th Motor Rifle Divisions could strain the Russians' logistics and compel the Russians to reconsolidate in order to preserve their combat power—by retreating east. That would take a lot of pressure off Lyman and, by extension, also take a lot of pressure off Sloviansk and Kramatorsk, the last two big free cities in Donetsk.

Lyman, which lies 15 km northeast of Sloviansk—the northernmost of the free cities—is the main obstacle between at least six Russian regiments and Sloviansk. The Russians have been inching toward Sloviansk and Kramatorsk from several directions for months now, racing against the coming winter to position forces for a possible siege of the twin cities next year. Winter in Ukraine punishes any attacker by depriving them of the leafy tree canopy that can conceal infiltrating troops during warmer months.

According to the most recent map from analyst and mapper Thorkill, one of the more reliable observers of unit-level action in Ukraine, the Ukrainian 3rd Assault Brigade is just a few kilometers away from linking up with the 60th Mechanized Brigade in or around the village of Kolodyazi.

Galloping advance

If true, that means the 3rd Assault Brigade and adjacent units from the 3rd Army Corps have carried out one of the more successful Ukrainian counteroffensives in memory. In April they first exploited gaps in Russian defenses north of the village of Nove. In May and June they advanced toward the village. In July they captured it.

After that, the attacking Ukrainians kept pushing south into the right flank of a 10-km-by-10-km salient that advancing Russian regiments created as they maneuvered around Lyman from the north, aiming to surround the town instead of directly assaulting it on their way toward Sloviansk.

Leaving their flank exposed, the Russians trying to encircle Lyman found themselves at risk of encirclement, instead. If the 3rd Assault Brigade or 60th Mechanized Brigade—together possessing thousands of troops, on paper—can march through Kolodyazi, they will have closed a ring of loose Ukrainian control around at least two Russian regiments, also with potentially thousands of troops.

Emphasis on loose control. Again, there aren't enough Ukrainian forces on the ground north of Lyman to prevent any "encircled" Russians from retreating back to the east. But that retreat would represent a major victory for the Ukrainian defenders north and east of Sloviansk. "The fall of this salient [north of Lyman] would significantly delay the fall of Lyman," analyst and mapper AMK Mapping predicted.

No one expects the Russians to halt their offensive toward Sloviansk and Kramatorsk. But in potentially taking two steps forward and one step back in their northerly march on the free cities, the Russians sacrifice time. Time the Ukrainians can use to stiffen their defenses in Sloviansk and Kramatorsk and evacuate more of the tens of thousands of civilians who remain in the cities despite the constant danger from Russian drones and bombs.

The possible extent of the Ukrainian gains north of Lyman—a 10-km march since April—is impressive given Russia's overall advantage in manpower and firepower in the east. Equally impressive is the operational security, or OPSEC, that cloaked the offensive until now. Sure, there were a few videos of action around Nove that hinted at a major Ukrainian action.

But the units involved exercised surprising discipline, and prevented too much information from leaking. "Someone in the 3rd Corps responsible for [OPSEC] is actually trying to do their job diligently and has quite effectively cut off information," Thorkill noted. The secrecy may have facilitated the Ukrainian advance by delaying any sense of panic among the Russian commanders who are responsible for reinforcing the Lyman salient, but who also tend to ignore bad news as long as possible because they know it could reflect poorly on them.

News of the counteroffensive is now available for all to see, even if official Ukrainian sources have yet to confirm it. That may mean time is running out for the 3rd Army Corps to close its pincer before the Russians retreat or reinforce. AMK Mapping has already seen some evidence of a "partial withdrawal from the most vulnerable positions in the salient.

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Russian forces are fighting against time to close a pincer around the last free cities in eastern Ukraine. The deadline: the coming winter, which will strip the leaves from the trees and leave any attacking force exposed to overhead surveillance and attack.

But in one key sector, Ukrainian forces are spoiling the coordinated Russian operation to partially surround Sloviansk and neighboring Kramatorsk. With admirable operational security, or OPSEC, a clutch of Ukrainian brigades under the 3rd Army Corps hasn't just blunted the advance of the Russian Center Group of Forces—it has pushed the Russians back.

This Ukrainian counterattack along the axis through the town of Lyman, ongoing since May, has largely escaped widespread notice. Yes, there is some scant video evidence of Ukrainian attacks. And yes, a few analysts have adjusted their maps to account for apparent Ukrainian advances, especially in the direction of Nove, a Russian-occupied village 15 km north of Lyman, which itself lies 15 km north of Sloviansk.

But for the most part, Ukrainian and Russian sources have avoided talking about Lyman. "The Ukrainians kept a good level of OPSEC and the Russians have been reluctant to publish videos from these areas" depicting their retreats, analyst and mapper Clément Molin noted in June, just a few weeks after the Ukrainians attacked toward Nove.

Molin, for one, expects the OPSEC to lift in the coming days. "By the end of the month, we should have an official update on the good results of a Ukrainian offensive that has largely remained secret," he wrote on Monday.

April offensive

The Ukrainians' limited counteroffensive around Lyman apparently kicked off on in mid-April. One of the first attacks that left any real evidence occurred on 22 May, when a small Ukrainian mechanized force—perhaps from the 60th or 66th Mechanized Brigade, the 77th Air Assault Brigade, or the Presidential Brigade—attacked in armored trucks and M-113, Stryker, and BTR-4 armored personnel carriers. Heavy bomber drones flew top cover.

The Russian 144th Motor Rifle Division fought back with its own drones. Interceptor drones took aim at the bombers. First-person-view and heavy bomber drones blasted at least one BTR-4, hitting it before and after it dropped off its infantry passengers. Drones struck some of the disembarked Ukrainian infantry.

How many Ukrainian troops survived and entrenched in new positions on 22 May is unclear. Regardless, the Ukrainian 3rd Army Corps wasn't done with Nove. Attacks continued. And sometime after the 22 May assault on Nove, "the Ukrainians managed to consolidate their gains," Molin concluded after scrutinizing a few videos and some satellite imagery.

By early July, Ukrainian forces had succeeded in "operationally encircl[ing] the Russian forces defending the village of Nove," according to analyst and mapper Thorkill. "Fierce fighting is currently underway to expel the Russians from that locality," Thorkill reported at the time.

The aim of the Ukrainian counterattacks is obvious. The 3rd Army Corps intends to put pressure on the northern right flank of 10 km-by-10-km salient jutting into the battleground north of Lyman. The Russian 144th Motor Rifle Division has been pouring troops into the salient, clearly intending to surround and isolate Lyman instead of directly assaulting it—all in order to clear a path toward Sloviansk.

Salients are risky for both sides, however. The farther the Russians extend their Lyman salient, the more exposed they are on their flanks. The Ukrainians know this. And even if the 3rd Army Corps can't fully cut across the salient in order to surround the Russians inside of it, the corps can at least take advantage of the salient's exposed flanks.

Capturing Nove, on the very northern edge of the salient, could allow the Ukrainians to bring to bear more artillery and drones on the Russians south of Nove. The 3rd Army Corps doesn't have to fully encircle the Russian troops closest to Lyman in order to hammer them with withering firepower.

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Just how successful the 3rd Army Corps has been in its local counteroffensive could become clearer very soon. That won't spell lasting relief for Sloviansk and Kramatorsk, however. Fighting against the clock as summer begins turning into fall and then winter, the Russians are slowly advancing toward the twin cities from several directions.

The siege of Kramatorsk and Sloviansk is coming. Perhaps not this year, but surely by 2027. To fully safeguard the twin cities, the Ukrainians would need to duplicate their success north of Lyman along several other directions.

That's a big ask of a Ukrainian force that's overall still outnumbered and outgunned.

Russian forces have gained ground on the eastern approaches to Sloviansk and continue to prioritize an eastern route toward the city, according to the Institute for the Study of War (ISW). Their earlier push from the northeast had bogged down, and Russia now aims to set up a future assault on one of the last major cities Ukraine still holds in Donetsk Oblast. A quick move on the city itself remains extremely unlikely, ISW said.

Russia's 2026 summer campaign in the east has advanced through field edges and small villages rather than the breakthroughs the Kremlin keeps promising, the grinding pattern that has defined the fighting across Donetsk Oblast for years.

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The eastern approach

Ukrainian military observer Kostiantyn Mashovets reported that Russian forward units are advancing across several tactical areas at once in the Sloviansk direction. He said the command of Russia's 3rd Combined Arms Army rushes assault infantry forward right after each successful infiltration. Russian troops reached the southeastern edge of Pyskunivka, east of Sloviansk, from the east and northeast, moving off positions they had seized on the southern bank of the Siverskyi Donets, Mashovets said. Zakitne lies northeast of Pyskunivka and Kryva Luka southeast of it, and ISW read the advance as evidence Russia has consolidated positions in both.

They also infiltrated the southern and southeastern outskirts of Mykolaivka from western Rai-Oleksandrivka. ISW assessed that Russia is running a dual effort to connect its units near Kryva Luka with those at Rai-Oleksandrivka, so it can assault Mykolaivka from dominant terrain to the east and south at once. Mashovets added that other Russian groups slipped through three settlements along the E-40 Bakhmut-Sloviansk highway, trying to hold the western bank of the Siverskyi Donets-Donbas Canal and reach the river just east of the city.

ISW observed reports on 23 August that Ukrainian forces repelled a Russian infiltration attempt in Mykolaivka.

Oleksandr Borodin, spokesperson for Ukraine's 3rd Army Corps, said the Lyman direction falls in his corps' zone and that Russia's goal there is to half-encircle the Sloviansk-Kramatorsk agglomeration from the flank—first securing bridgeheads across the rivers, then cutting logistics. He called those plans unrealistic:

"We have quite serious defensive positions there and have been preparing for a long time. The capabilities they currently have to try to accomplish this task are insufficient even to come close to achieving such a goal."

Why Moscow switched directions

Russia prioritized attacking Sloviansk from the northeast through Lyman when it opened its spring-summer 2026 offensive, but that effort has largely stalled. The Siverskyi Donets River, which loops north and northeast of the city, together with a web of canals, handed Ukrainian defenders a natural moat. So Russian commanders now treat Mykolaivka as a key prize. Taking it would let them strike west toward Sloviansk from the east, skirting the water obstacles that blocked the northeastern route.

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A slow road into the Fortress Belt

Sloviansk anchors the northern end of Ukraine's Fortress Belt, a chain of fortified cities that has blunted Russian advances in Donetsk Oblast since 2014. ISW cautioned that Russian forces are extremely unlikely to make fast gains west of Mykolaivka, since they still need to seize several more settlements first.

Ukraine's President Volodymyr Zelenskyy said on 23 August that Putin has ordered his army to seize all of Donetsk Oblast by 31 December. By ISW's count, it is the 15th such deadline since 2022, and Russia has missed every one that has come due.

Zelenskyy put Russia's frontline casualties this year at around 267,000, including about 155,000 killed, and said 70% to 80% of them fall in the Kostiantynivka direction. Russia holds about 79.89% of Donetsk Oblast, by ISW's count, and Zelenskyy said the Kremlin is preparing to mobilize around 300,000 men after the 18–20 September State Duma elections, partly to reinforce Donetsk and Luhansk oblasts.

Ukrainian analysts warn that the situation on a key stretch of the Donetsk front is becoming increasingly dangerous for two cities central to Ukraine's defense. The eastern flank of the Sloviansk-Kramatorsk agglomeration is taking on an increasingly threatening character, and earlier stabilization measures are clearly not working, military analyst Oleksandr Kovalenko said.

The two cities anchor the line that has held Russia back for over a decade. Sloviansk and Kramatorsk form part of the so-called fortress belt, the line of Ukrainian fortifications that has restrained the Russian advance since 2014. The agglomeration serves as the most important bastion and logistics hub for Ukrainian forces in the east. A threat to it is a threat to the backbone of Ukraine's defense in Donbas.

Russia is 12 to 13 km away

Kovalenko laid out how close Russian forces have come. Their forward positions are 12-13 kilometers from Sloviansk and Kramatorsk. He warned that if Russia's pace does not slow, the first infiltrations into both cities could come by December 2026.

The advance is measured in ground lost. The problem on the eastern flank runs about 30 kilometers, where Russia's 3rd Combined Arms Army operates.

"Only in the third week of August, Russian forces captured 21 square kilometers of Ukrainian territory in this section of the frontline," the expert said.

Russia uses the terrain of the "Cretaceous Flora" reserve, its hilly micro-relief rather than open steppe, to advance, absorbing not just square kilometers into pockets but villages and settlements.

The flank threatens neighboring sectors

The deterioration is spreading pressure sideways. The advance creates pressure from the southern bank of the Siverskyi Donets on the zone of the 3rd Army Corps, which had stabilized the Lyman direction and pinned Russian forces near Yampil, Kovalenko believes. The former Siverskyi direction saw the fastest rate of territorial loss of any sector in 2025, slowed in April and May 2026, but the 3rd Combined Arms Army's advance has not yet been stopped.

The cumulative loss is large. After losing more than 500 square kilometers over a year, the unstable flank, sagging since June 2025, is becoming a problem for other directions, looming over or pressuring them.

Kovalenko argued the sector has gone months without attention while threatening both the main agglomeration and the successfully held directions around it.

Analysts urge reinforcement before it is too late

Kovalenko proposed a specific fix. The sector must be reinforced as soon as possible, he said, suggesting that the nearest resource, Andrii Biletsky's 3rd Army Corps, often described as one of the most capable formations in Ukraine's forces, be used at least to relieve both banks of the Siverskyi Donets.

"Once infiltrations into Sloviansk and Kramatorsk begin, reinforcing garrisons and landing intelligence-directorate troops will not solve the problem but only delay the inevitable," he warned.

A second analyst gave a similar warning. Yurii Butusov, a drone company commander in the National Guard's "Khartia" corps, said that if Ukraine's forces retreat from there, Russia gains tactical advantages and Sloviansk-Kramatorsk is gradually lost, ultimately leading to the loss of the Donbas.

He also said that only Biletskyi can take responsibility for this battle.

"Only orderly command and organization at the front now will allow us to turn the course of a battle that is so far not going in our favor," Butusov said.

Russian troops are slowly marching toward and around Kramatorsk and Sloviansk, the last two big free cities in eastern Ukraine's Donetsk Oblast.

The Russians have a standard playbook for taking a Ukrainian city, and running it means doing two things at the same time. Along the nearly 100-km Kramatorsk front, they don't have the infantry to do both at once. Every time a Ukrainian brigade holds somewhere, the Russians have to move men to cover it—and something stalls somewhere else.

That strategy is simple in concept but difficult in practice. The idea is for Russian forces to advance along a city's under-protected flanks in order to put pressure on the main supply lines of the city's garrison. As the flank attacks squeeze the garrison's logistics, Russian infiltrators slip into the city, hoping to create a lodgement for follow-on forces.

The final assault through that lodgement comes late in the campaign, after the Ukrainians are already weakened by a lack of supplies.

The strategy only works when the troops on the flanks and those in the middle work together. The former squeezes. The latter infiltrates. The problem for the Russian Center Group of Forces on the Kramatorsk front is that it's not squeezing and infiltrating at the same time. That delays the overall Russian advance and buys time for Ukrainian forces to dig in, reinforce, and hope for a miracle.

"Russian offensive planning at the operational level remains disciplined," mapper and analyst Vitaly explained. But only "on paper," Vitaly added. "Groupings are sequenced, axes are assigned, objectives are staggered."

"What the discipline is not is well-manned," the mapper wrote.

Vitaly reads one recent Russian adaptation as evidence of the shortfall rather than of cleverness. "I read the shift to two- and three-man infiltration teams on motorcycles and ATVs as less a sign of tactical innovation than of a manpower deficit that organization is straining to hide," he wrote.

Manpower shortages

Ukraine's manpower problems are well-known. Fewer observers appreciate that Russia struggles, too. Yes, the Russians still recruit around 30,000 fresh troops every month. In theory, that's enough new manpower to replace monthly losses.

But replacing casualties is not the same as resourcing a strategy. Ukraine's commander-in-chief Oleksandr Syrskyi put the Russian force in Ukraine at 721,300 at the end of June—a gain of only around 11,000 since late 2025, against Russian losses he estimated at 30,000 to 35,000 a month. Contract recruitment collapsed in the spring, falling by a third year on year, and Ukraine's foreign intelligence service counted 195,000 contract recruits by early July against an annual target of 409,000.

A Russian general, speaking anonymously to the investigative outlet IStories, put the requirement more starkly. To capture the rest of the Ukrainian-held Donbas, he said Russia would need to replace at least 55,000 to 60,000 casualties every month—roughly double what it recruits. That figure rests on a single unnamed source and should be weighed accordingly. But it describes the same gap Vitaly sees on the map.

When a Ukrainian brigade defeats one attack anywhere along the Kramatorsk front, it may compel Russian regiments to shuffle troops between units in order to quickly replace the losses. The shuffle may sap the combat power of a flanking or infiltration unit working along some other section of the front.

A weak flanking unit may not be able to keep up the pressure on enemy supply lines, perhaps imperiling the adjacent infiltration unit as it probes for the gaps in Ukrainian defenses that the flankers were supposed to help create. By the same token, weak infiltrators may find gaps in Ukrainian defenses, but fail to secure a lodgement—effectively wasting the efforts of the adjacent flankers.

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"That gap keeps producing the same effect," Vitaly explained. The Ukrainian armed forces' "ability to hold separate sections of the front independently forces Russian formations to compensate for each other's failures, and that compensation creates new stalls."

Vitaly gave a name to the effect, and was careful about what he was not claiming. "I call it structural deterrence—not deterrence in the conventional sense, and not a doctrine, but the byproduct of asking an undermanned army to keep a sequenced plan on schedule."

A byproduct is not a defense, and it holds only as long as the Ukrainians can keep producing it. That requires synchronization of their own. Supplies and reinforcements must arrive when and where they're most badly needed. Air and artillery support should shift from sector to sector depending on the urgency of the local garrisons' needs.

All that is to say, the lack of synchronization that has slowed the Russians' march on Kramatorsk could eventually speed up the Russians' march—if and when the Ukrainians are the ones struggling to synchronize.

It's worth noting that the Russians aren't advancing fast toward Kramatorsk and Sloviansk, but they are advancing—especially from the northeast.

The Russians may not be perfectly synchronized. But they're clearly synchronized enough to grind toward the last free cities in Donetsk. Just very, very slowly.

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