Fortress Belt Defense Has Stalled Russian Advance For This Year

While Russian infiltrations and minor advances towards Ukraine's Fortress Belt continue, the strength and depth of Ukrainian defenses, as well as the difficulty of the terrain on its approaches and the casualties Russian units are suffering are increasingly believed to mean that the Kremlin's objective to attack, let alone take, those cities this year is likely remain unrealistic. JL

Euromaidan Press reports:

Difficult terrain, crisscrossed by the Donets Canal and dense Ukrainian fortifications, complicates Russian attacks. There are few protected approaches toward Sloviansk from the Russians’ main bases in the ruins of Siversk, 31 km to the east. A doomed Russian tank assault on July 22nd along the southern approaches was (emblematic of the challenges) Russia faces. And one big town stands between the Russians and the free city: Mykolaivka. And the Ukrainians are bombarding Russian supply lines with intensity.  “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.”

A doomed Russian tank assault on 22 July along the southern approaches to the twin cities of Kramatorsk and Sloviansk, the last big free cities in eastern Ukraine’s Donetsk Oblast, was ultimately a sideshow. The Russians’ main effort, in their long and bloody campaign to capture all of Donetsk, is playing out in the north, not the south. 

The front northeast of Sloviansk “has been the most successful for the Russian army throughout 2026,” mapper Clément Molin noted. 

The bad news for Ukraine is that its forces in the area—parts of six brigades including the 53rd, 54th and 63rd Mechanized Brigades and the 81st Air Mobile Brigade and the 117th and 120th Territorial Defense Brigades—are “insufficient,” according to Molin. 

Worse, relentless Russian bombardment of the roads and paths leading to and through Sloviansk means the Ukrainians may struggle to sustain any additional brigades in the area. Assuming there are any free brigades, of course. 

The bombardment is intensifying. On 31 July, a Russian warplane struck the Sloviansk Chemical Plant, deep inside the city, with a 1,500-kg KAB-1500 precision glide bomb. “The city has come under increasingly heavy attacks in recent days,” AMK Mapping noted.

But the same difficult terrain, crisscrossed by the Donets Canal and dense Ukrainian fortifications, complicates Russian attacks. There are few protected approaches toward Sloviansk from the Russians’ main bases in the ruins of Siversk, 31 km to the east. And one big town town stands between the Russians and the free city: Mykolaivka. 

And the Ukrainians are bombarding Russian supply lines with the same intensity that the Russians are bombarding Ukrainian supply line. It’s for those reasons that Molin expects the Russians to eventually lay siege to Sloviansk and neighboring Kramatorsk from the northeast.

But not anytime soon. “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 predicted. 

Crawling advance

The slow pace of the Russian advance belies the worsening conditions in Sloviansk and Kramatorsk. Out of a combined pre-war population of around 440,000, just 90,000 people remain in the twin cities. The other 350,000 have fled.  

As the cities slowly empty, all eyes turn to the tiny village of Rai-Oleksandrivka, 14 km east of Sloviansk. “This small village, seemingly insignificant at first glance, is actually of strategic importance, as the surrounding high ground overlooks the city of Sloviansk,” Molin explained. 

“In recent weeks, Russian forces have been consolidating their hold on the village and the surrounding heights, even though Ukrainian troops still maintain positions in many areas,” Molin wrote. 

Russian forces are already relentlessly bombarding Ukrainian supply lines in the area with air-launched glide bombs. As Russian ground forces advance closer to Sloviansk and consolidate along key heights such as those around Rai-Oleksandrivka, they can begin aiming more tube artillery at the same supply lines, compounding the Ukrainians’ logistical problems. 

The coming battle is neither won nor lost yet. But time is running out for Ukrainian forces to reset the battlefield in their favor. 

If the Ukrainian command can prioritize the front, and push enough supplies to front-line positions, it might yet save Sloviansk and Kramatorsk. As Ukrainian Pres. Volodymyr Zelensky completes his reshuffle of key civilian and military leaders and a new command, that command’s attention “must shift to the Donbas,” Molin stressed.