Struggling to cross a small river north of the ruins of Myrnohrad in eastern Ukraine's Donetsk Oblast last year, the Russian 40th Naval Infantry Brigade deployed a new kind of bridgelayer: an up-armored T-80 turtle tank with a short metal span attached to its front. The kind of span that, hastily dropped over the narrowest stretch of a small river or some other gap, could help trailing vehicles and infantry quickly cross and continue their attack.

The improvised bridgelayer, first identified by open-source analyst Moklasen in late December, is crude and unwieldy. Sure, a T-80 can haul a front-mounted bridge span weighing a few tons. But how can a tank crew precisely lay down and adjust the span without first climbing out of their tank and exposing themselves to artillery and drones? Moreover, the turtle bridge is bulky, surely suffers a speed and mobility penalty from the extra weight, and is even more vulnerable to drone attack than the typical tank.

It should come as no surprise that the turtle bridge failed in one of its earliest deployments along the Kazennyi Toretsk River as 2025 wore into 2026.

Short Footage of Two Russian T-80BVM Tanks of the 40th Separate Guards Naval Infantry Brigade in the Rear - 2025/26 pic.twitter.com/4QkPaNWWsE

— Wilson (@WillKnowler) November 9, 2026

But it's apparent the 40th Naval Infantry Brigade hasn't given up on the type. Observer Will Knowler recently noted footage of the T-80 bridge turtle in training in the Russian rear in warmer weather than the snowy conditions in which the bridge turtle first appeared. It's not clear exactly when the footage was shot, but it may have been this fall or the preceding spring. After the failed bridging attempts 11 months ago in December.

The Russians aren't foolish for continuing to tinker with their turtle bridge. Many of Russia’s improvised assault vehicles—welded together in front-line workshops in response to changing battlefield conditions—don’t work until they abruptly do work ... and help Russian troops advance deeper into Ukraine. So as awkward as the turtle bridge may appear to be, it may also eventually accomplish its mission: placing short bridges over narrow obstacles preventing Russian forces from advancing.

some more details on the turtle tank with detachable single mobile bridging link.
the naval infantry grouping last used it in winter 2025 trying to gap the Kazennyi Toretsk River in the dobropillia areahttps://t.co/ZLV4Ej30Nxhttps://t.co/72iAkNasa0 https://t.co/flAuPG5atC pic.twitter.com/iKAN3uZM3W

— imi (m) (@moklasen) November 12, 2026

Tactical shift

The improvised bridgelayer signaled a tactical shift as the Russian Center Group of Forces pivoted from urban fighting in Myrnohrad to open terrain back north of the city's ruins back in December. The Center Group of Forces' aim, then as now, was to force one of the main southern routes toward Kramatorsk and neighboring Sloviansk, the last two big free cities in Donetsk Oblast.

The southern routes were important a year ago. They're even more important now that the Ukrainian 3rd Army Corps has, by way of its robot-led Operation Vivaldi counteroffensive, forced the Russian 20th and 25th Combined Arms Armies away from the northern approach to the free twin cities.

If the Russians can finally solve their river-crossing problem, the 25-km path to Kramatorsk may open wider for a faster advance. That doesn't mean Kramatorsk is in imminent danger. Quite the contrary. There are other obstacles besides rivers. Those 25 km between the current disputed gray zone and the outskirts of Kramatorsk are some of the deadliest in the world, especially for an attacker. Mines, drones, and artillery can exact thousands of casualties for every kilometer an attacker advances.

It's not for no reason the Russians are struggling to open a southern route toward Kramatorsk, either from the ruins of Kostiantynivka through Druzhkivka and then onward to Kramatorsk or from Toretske through Druzhkivka farther to the west. In a year of hard fighting, the Russians have pushed the gray zone around 10 km toward Kramatorsk along the westernmost approach. But the easternmost approach, through Kostiantynivka, has proved even tougher for the Russians.

The first Russian infiltrators slipped into Kostiantynivka more than a year ago. Flash forward at least 13 months, and the city is still contested, with at least a few stubborn Ukrainian defenders clinging to positions across the destroyed city. No bridge-hauling turtle tank is going to help much when many Russians can't even advance past the ruins of Kostiantynivka.