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Ukraine's fortress cities under fire as Russia bids to seize rest of Donbas

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BBC News

September 12, 2026
Ukraine's fortress cities under fire as Russia bids to seize rest of Donbas

Russian forces have intensified ground assaults on the Ukrainian fortress cities of Slovyansk and Kramatorsk. Authorities are mandating civilian evacuations due to the constant threat of daily glide bomb attacks.

The Escalating Crisis in Ukraine's Donbas Fortress Cities

The ongoing conflict in eastern Ukraine has entered a critical phase, with the cities of Slovyansk and Kramatorsk emerging as the primary targets of Russian military aggression. These two urban centers represent the largest remaining strongholds under full Ukrainian control within the contested Donbas region. As Russian forces intensify their ground assaults, the strategic necessity of holding these locations has turned them into the focal point of the current theater of war.

The Human Cost of Strategic Warfare

As security conditions deteriorate, the local administration has reached a grim conclusion: civilian presence is no longer tenable. Pavlo Dyachenko of the Donetsk police has confirmed that forced evacuations are now underway, particularly targeting families with children. This measure is described not as a policy preference, but as a desperate, life-saving necessity. The frequency of aerial bombardment, specifically the use of glide bombs, has surged from a weekly occurrence to a near-daily reality, rendering daily life in these cities increasingly perilous.

Dismantling the 'Fortress Belt'

Slovyansk, Kramatorsk, and the southern city of Kostyantynivka constitute the core of Ukraine’s so-called 'fortress belt.' This defensive infrastructure was meticulously constructed over years to provide a layered, reinforced barrier against eastern incursions. The system was designed to stall the Russian advance through urban attrition and fortified positions. However, the current intensity of Russian fire is testing the structural integrity of these defenses, creating a precarious situation for the Ukrainian military.

The Vulnerability of Kostyantynivka

While Slovyansk and Kramatorsk remain the primary focus of current assaults, the broader defensive strategy is under strain. Reports indicate that Kostyantynivka, a vital link in this defensive chain, is currently suffering from a limited presence of Ukrainian troops. This deficiency creates a tactical vulnerability that could allow Russian forces to outflank the broader defensive network if the primary fortress cities fall or are forced to divert resources.

Broader Implications and Future Trends

The systematic targeting of these cities suggests a renewed Russian commitment to capturing the entirety of the Donbas region. By forcing civilian evacuations, the Russian military is attempting to remove the constraints of collateral damage that typically hinder urban warfare, potentially signaling an intent to escalate the intensity of their shelling. If the 'fortress belt' collapses, the strategic depth of Ukrainian control in the east would be severely compromised, likely forcing a retreat to secondary defensive lines further west.

Conclusion

The situation in Slovyansk and Kramatorsk serves as a stark reminder of the brutal reality of the conflict. As the 'fortress belt' faces unprecedented pressure, the decision to evacuate civilians underscores the severity of the Russian offensive. The coming weeks will likely determine whether these cities can withstand the onslaught or if the frontline will be forced to shift significantly deeper into Ukrainian territory.

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