Russian Bridgehead North of Kupiansk Is Shrinking Due To Ukrainian Pressure

This is a smaller version of what is happening around Lyman due to Operation Vivaldi. The Kupiansk salient is different in many ways, but the Ukrainian tactics - drone recon guiding infantry to eliminate individual Russian positions, quietly, over time - are adding up to a similar result. JL

Ryder Blackthorn reports in Frontline Signal:

Something is changing north of Kupiansk. Wooded areas are being cleared, individual Russian positions are disappearing, and terrain around the Dvorichna bridgehead have been shifting back toward Ukrainian control. The Russian bridgehead has been shrinking for  for more than a month. Drone teams locate Russian positions. Small assault groups move in underneath that surveillance, clear the position, and establish control. Then they move on to the next. Against a bridgehead held partly through scattered positions and narrow supply routes, those little pieces start adding up. Russian attack intensity in the Kupiansk area was roughly half what it had been in August. Signs of exhaustion are becoming visible among Russian formations. If enough of those little pieces disappear, the bridgehead starts disappearing with them.

Something is changing north of Kupiansk. Not in the giant-arrow-on-a-map kind of way. There hasn’t been some massive armored breakthrough, and Ukrainian forces haven’t suddenly pushed Russia back dozens of kilometers. The movement has been smaller. Wooded areas are being cleared, individual Russian positions are disappearing, and pieces of terrain around the Dvorichna bridgehead have been shifting back toward Ukrainian control. None of those changes looks particularly dramatic by itself, but they’ve been happening around the same Russian foothold for more than a month.

On September 28, geolocated footage showed Ukrainian forces clearing Russian positions north of Kalynove, northwest of Kupiansk. ISW assessed that the footage indicated another Ukrainian advance in the area. A day later, DeepState updated its map to show 0.25 square kilometers restored to Ukrainian control near Kalynove, while another 0.32 square kilometers shifted from Russian control into the gray zone. A quarter of a square kilometer isn’t the story; the direction of movement is.

This Bridgehead Has Been Shrinking for Weeks

By late August, Russian forces held a foothold west of the Oskil River north of Kupiansk, with Dvorichna forming a key part of the Russian position. That foothold matters because Russian troops are already on the same side of the river as Kupiansk. From there, small assault groups can try to move south through the wooded terrain and settlements around Zapadne and Holubivka toward the city instead of having to force another river crossing every time Russia wants to send infantry forward. 

Ukraine began squeezing that position during August. On August 26, Joint Forces spokesperson Viktor Trehubov confirmed Ukrainian advances southwest of Dvorichna and into the northern part of Zapadne. He said the operation had narrowed the Russian bridgehead and complicated the logistics supporting Russian infiltration attempts toward Kupiansk. Then on September 3, the 23rd Assault Regiment of the 2nd Khartiia Corps reported clearing another four square kilometers between Dvorichna and Zapadne. The unit claimed the broader series of operations had brought 13.5 square kilometers back under Ukrainian control by that point. That larger number comes from the regiment and has not been independently verified in full.

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Map showing the territories liberated by fighters of the 23rd Assault Regiment, September 2026, | Credit: Militarnyi

By September 12, Trehubov was openly describing the Russian foothold as shrinking. He was also careful about what Ukraine had not accomplished: Dvorichna itself had not been liberated. The focus, according to Trehubov, was reducing the Russian bridgehead on the western bank of the Oskil and forcing Russian troops closer to the river. On September 15, he again said the bridgehead was becoming smaller and described Dvorichna as the key Russian-held settlement there. Then on September 22, he confirmed additional Ukrainian gains near Zapadne as part of the same effort. So the latest movement around Kalynove didn’t appear out of nowhere; it’s another piece of an operation that has been developing for weeks.

Zapadne Shows What This Fight Actually Looks Like

The fighting north of Kupiansk doesn’t look much like the sweeping counteroffensives people imagine when they hear that Ukrainian forces are taking ground back. On September 29, the 23rd Assault Regiment released footage from another operation south of Zapadne. Four Ukrainian soldiers moved through wooded terrain while drone operators provided reconnaissance and support from above. According to the regiment, the assault group destroyed a Russian shelter, captured one Russian soldier, and established control over the position. 

Four soldiers clearing one tree line doesn’t produce a dramatic change on the map. But it gives us a pretty good look at how some of this ground is changing hands. Drone teams locate Russian positions and watch the terrain. Small assault groups move in underneath that surveillance, clear the position, and establish control. Then they move on to the next piece. Against a bridgehead held partly through scattered infantry positions, wooded areas, and narrow supply routes, those little pieces start adding up.

Russia’s Routes Were Already Getting Narrower

The geography around Dvorichna makes the situation more interesting. Earlier in September, Trehubov said Ukrainian advances had reduced Russia’s options for moving troops south from the bridgehead. According to him, the only remaining open road for Russian forces on this part of the western bank ran south along the Oskil through Holubivka. As Ukrainian forces narrowed the bridgehead, he said Russian troops moving along that route were becoming increasingly exposed to Ukrainian drones.

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Illustrative Photo | Credit: General Staff of the Armed Forces of Ukraine

That’s where a tiny territorial gain can matter more than the number suggests. A patch of woods might be a rounding error on a frontline map. But if taking it puts another supply route under observation or strips cover away from infantry moving south, that little patch suddenly matters quite a bit. Russian forces still have ground here, they still have troops operating around Kupiansk, and they still have routes feeding those positions. The amount of room available to connect all of those pieces, however, appears to be getting smaller.

Russian Attacks Have Slowed Too

At the same time, Russian offensive activity around Kupiansk has dropped. Trehubov said on September 29 that Russian attack intensity in the Kupiansk direction was roughly half what it had been in August. Russian forces remain active east of the Oskil, but Trehubov said signs of exhaustion were becoming visible among Russian formations operating around Kupiansk. ISW separately noted the declining operational tempo in its September 29 assessment. Ukraine’s General Staff reported only one combat engagement in the Kupiansk direction between September 28 and 29.

It would be tempting to draw a straight line between the shrinking bridgehead and the decline in Russian attacks. The evidence doesn’t let us do that yet. Weather is part of the picture too. A Ukrainian brigade spokesperson told ISW on September 24 that autumn rain had significantly reduced Russian offensive activity around Kupiansk because poor weather was making drone operations more difficult. Russian troops were still conducting small-group infiltration missions with artillery support. Between rotating units, shifting weather, and standard operational pauses before a new push, one quiet day doesn’t reveal very much. A broader decline across September, happening alongside Ukrainian pressure on the bridgehead, is more interesting.

Russia Still Has Troops Inside Kupiansk

There is another reason not to oversell what Ukraine is accomplishing north of the city. Russian forces still maintain a presence in parts of northern Kupiansk. Trehubov said there was a small engagement inside the city on September 28 involving two Russian soldiers, whom he said Ukrainian forces killed. He estimated that several dozen Russian personnel remained in the northern parts of Kupiansk. Those are Ukrainian military claims and have not been independently verified.

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Illustrative Photo — Severe destruction of residential buildings in Kupiansk, a city in Ukraine’s Kharkiv Oblast | Source: https://www.objectiv.tv/uk/objectively/2026/09/29/bij-u-kup-yansku-ta-mini-vivaldi-bilya-dvorichnoyi-tregubov-pro-front/

Russia has relied heavily on small-group infiltration tactics around the city, and that makes the battlefield messy. A handful of Russian soldiers appearing inside an area does not necessarily mean Russia controls the neighborhood around them. But they can’t simply be ignored either. Those groups still require ammunition, food, and communications to remain operational. And if Russia wants to keep sending replacements south, somebody has to get them there. That brings us straight back to Dvorichna.

Why the Dvorichna Bridgehead Matters

The Russian foothold gives Moscow something extremely useful: ground west of the Oskil River. The river is one of the major geographic barriers in this part of the battlefield. A durable bridgehead means Russia doesn’t have to start every attempt to pressure Kupiansk from the north by crossing the Oskil again. It already has troops across. Dvorichna anchors the foothold farther north, while routes through places like Zapadne and Holubivka connect the broader area toward Kupiansk.

The more ground Russia can hold there, the more room it has to stage infantry, hide small groups, and maintain supply routes. Shrink that area and the geometry gets worse. Routes narrow, positions become more isolated, supply movements become easier for Ukrainian drones to watch, and small infantry groups lose places to hide. Eventually, the Oskil sitting behind those positions becomes less helpful to Russia and more of a logistical problem. That doesn’t mean the bridgehead is close to collapsing. It means every piece Ukraine removes makes what remains a little harder to hold.

Kupiansk itself adds another reason this matters. The city is an important logistics hub connecting eastern Kharkiv Oblast with routes toward Donetsk and Luhansk oblasts. Russia isn’t fighting for every forest belt north of Kupiansk because somebody desperately wants that particular collection of trees. Those positions help Russia keep pressure on the city.

Russian Sources Are Seeing the Logistics Problem Too

We don’t have to rely entirely on Ukrainian descriptions of the situation. ISW reported on September 27 that a source associated with Russia’s Western Grouping of Forces acknowledged that the high volume of Ukrainian drones was complicating both Russian offensive operations and logistics in the Kupiansk direction. That doesn’t independently confirm every Ukrainian claim about the bridgehead. But it does show that at least some Russian military-linked reporting is describing the same underlying problem. Holding a forward position is one thing. Keeping enough ammunition, food, troops, and equipment moving into it while Ukrainian drones watch the roads behind you is another.

Then Trehubov Mentioned Vivaldi

This comparison didn’t come from somebody looking at two maps and deciding they looked vaguely similar. It came from Trehubov. Speaking on September 29, he said Russia’s Dvorichna bridgehead was gradually shrinking and compared the dynamic with Ukraine’s Operation Vivaldi around Lyman. But he immediately put limits on the comparison. The fighting around Dvorichna is smaller and slower, the terrain is different, and there are fewer troops involved. Trehubov’s point was that the general scenario looked similar: Ukrainian forces progressively reducing a Russian foothold rather than wiping it out in one giant attack.

While the general logic is similar, the actual operations look very different. Vivaldi involved deep strikes against logistics, electronic warfare, large numbers of drones, unmanned ground systems, deception operations, and considerably larger territorial gains. North of Kupiansk, what we can actually verify is much smaller: assault teams clearing tree lines and individual Russian positions. Different scale, different battlefield, but there is one idea connecting them: Ukraine doesn’t necessarily need one spectacular breakthrough if it can keep making the Russian position smaller, harder to supply, and more expensive to hold.

The Oskil Makes This Fight Different

The river also puts a hard limit on how far the Vivaldi comparison can go. Around Lyman, Ukraine was attacking a Russian salient across a much broader area of contested ground. At Dvorichna, much of the Russian foothold sits with the Oskil behind it. That changes the problem. Ukraine doesn’t necessarily have to roll through the entire bridgehead in one attack to make the position increasingly difficult to hold. If Ukrainian troops keep squeezing Russian forces toward the river while drones make the remaining supply routes more dangerous, Russia has a handful of choices. It can reinforce the bridgehead, accept increasingly difficult logistics, pull positions closer to the Oskil, or surrender more ground. None of that requires some giant blue arrow across the map.

Something Is Changing, Just Slowly

There still isn’t enough evidence to call what’s happening north of Kupiansk a major Ukrainian breakthrough. It isn’t one. Dvorichna remains the central Russian position in the bridgehead, Russian troops are still active east of the Oskil, and the drop in Russian attacks could change quickly, particularly as weather and unit rotations change.

What we do have is a bridgehead that Ukrainian forces have been pressing for more than a month, backed by geolocated footage of fresh advances near Kalynove and ongoing small-unit clearance operations in the woods. Russian military-linked reporting acknowledges that Ukrainian drones are making logistics harder, and Ukrainian officials say Russian attack intensity in the sector has fallen substantially from August. None of that is dramatic by itself. Together, it shows a Russian foothold under steady pressure.

Russia spent months trying to turn its positions west of the Oskil into a platform for continued pressure on Kupiansk. Ukraine is slowly shaving pieces off that platform.

A tree line doesn’t look like much on a map. Neither does a quarter of a square kilometer.

But if enough of those little pieces disappear, eventually the bridgehead starts disappearing with them.