Brutal Ukrainian Mykolaivka Defense Has Disrupted Russia's Sloviansk Attack Plans

The Kremlin has wanted to take Ukraine's Fortress Belt for over four years - and this summer was supposed to be the beginning of their most serious effort. But before they get into position to do so, they have to remove some other challenging obstacles, not the least of which is the Ukrainian 81st Airmobile Brigade defending Mykolaivka to the east. 

Suffice it to say that analysts are now casting doubt on the Russians' ability to even start the Sloviansk offensive this year - and possibly even next - due to the stout, ferocious defense of Mykolaivka, which shows no signs of letting up anytime soon. JL

Euromaidan Press reports:

Expect a long, hard fight in and around the ruins of Mykolaivka, the eastern gateway to Sloviansk. "It is highly unlikely that the battle for Sloviansk will begin this year, not least because the fighting in Mykolaivka is likely to be prolonged." Russian assault groups are attacking the apartment blocks along the town's eastern edge. Mykolaivka sits 8 km east of Sloviansk, one of just two big free cities in Donetsk Oblast, and taking it is the precondition for any Russian siege of the city. Russia has largely exhausted its offensive options and Mykolaivka "will come at a very high cost, especially given the extensive fortifications the Ukrainians have built in the area over recent months."

For years, Russian troops probed the Ukrainian garrison at Mykolaivka in eastern Ukraine's Donetsk Oblast, sending in small teams of infiltrators for the defenders to hunt down. On 29 July, they stopped probing. "The Russians have begun an assault on Mykolaivka from the east," observer Thorkill reported, citing the local Ukrainian Telegram channel nikolaevka_online.

Russian assault groups are attacking the apartment blocks along the town's eastern edge. Mykolaivka sits 8 km east of Sloviansk, one of just two big free cities in Donetsk Oblast, and taking it is the precondition for any Russian siege of the city. "The situation is deteriorating," nikolaevka_online warned.

Mykolaivka is "the eastern gateway to Sloviansk," according to mapper Clément Molin. The Russian offensive in Donetsk aims to lay siege to and ultimately capture Sloviansk and neighboring Kramatorsk, which together are still home to nearly 100,000 people despite hundreds of thousands of others having fled.

A Ukrainian garrison anchored by the 81st Airmobile Brigade has defended Mykolaivka for years. But the garrison has been struggling to interdict every team of Russian infiltrators—and now the infiltrators have company.

The sector is an exception to a mostly frozen front. Russian troops captured 106 square km of Ukrainian territory in July, according to the Blackbird Group—the fastest Russian advance since January, but a fifth of what the Russians seized in July 2025. Blackbird reads the figure as evidence Russia has largely exhausted its offensive options; in June, Russian forces lost 9 square km on net. The slow average along the 1,200 km gray zone belies much faster movement in a handful of sectors, and east of Sloviansk is one of them. 

Expect a long, hard fight in and around the ruins of Mykolaivka. "It is highly unlikely that the battle for Sloviansk will begin this year, not least because the fighting in Mykolaivka is likely to be prolonged," Molin explained.

Tough terrain

The geography is difficult for both the defenders and the attackers. The Donets Canal, which abuts Mykolaivka on the west, "aids the Ukrainian defense just as much as it facilitates the Russian offensive," Molin noted. To reinforce the 81st Airmobile Brigade in and around Mykolaivka, Ukrainian troops must cross the canal while under Russian fire. "Massing troops there is a highly complex undertaking," Molin warned.

Map: Euromaidan Press

But the Russian army will face the same challenge if and when it marches through Mykolaivka. "Crossing the canal, particularly around the Sloviansk power plant and its network of waterways, will come at a very high cost, especially given the extensive fortifications the Ukrainians have built in the area over recent months," according to Molin.

In other words, the 81st Airmobile Brigade has fallback positions on the near side of the Donets Canal. If the brigade can't hold Mykolaivka, maybe it can hold the canal—and delay if not halt further Russian advances toward Sloviansk.

The Ukrainians would prefer to hold in Mykolaivka, of course. But it's looking increasingly dire. The Russians appear to be accumulating in the seasonal homes, or "dachas," on the northeastern outskirts of Mykolaivka. "It is difficult to say at this point how many Russian soldiers have infiltrated there," Thorkill wrote. "However, their very presence has forced the command of the 81st Air Assault Brigade—responsible for the city's defense—to secure with patrols." 

The Ukrainian brigade is trying to build a wall of infantry and drones between the dachas and a key road intersection that can carry defenders and attackers across central Mykolaivka.

But the 81st Airmobile Brigade is outnumbered, probably badly so. For the first two years of the wider war, the brigade could count on help from the 54th Mechanized Brigade, which clung to the 81st Airmobile Brigade's right flank.

While the 54th Mechanized Brigade still registers on many maps of the gray zone, in fact it's barely there. "Various snippets of information indicate that the 54th Mechanized Brigade—longtime right-flank neighbor of the 81st Brigade—was completely withdrawn from the front between June and July 2024 and sent to the deep rear," Thorkill wrote. East of Sloviansk, "only its drone group remained."

"The unit had long been a brigade in name only," Thorkill noted. So the 81st Airmobile Brigade fights mostly alone, for now—defending the gateway to Sloviansk.