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16 August 2025

The Critical Importance of Ukraine’s Fortress Belt in Donetsk Oblast

ISW Press

Kremlin officials are reportedly demanding that Ukraine cede to Russia strategically vital unoccupied territory in Donetsk Oblast and freeze the frontline in other areas as part of a ceasefire agreement. The surrender of the rest of Donetsk Oblast as the prerequisite of a ceasefire with no commitment to a final peace settlement ending the war would force Ukraine to abandon its "fortress belt," the main fortified defensive line in Donetsk Oblast since 2014, with no guarantee that fighting will not resume. Putin's reported proposal reportedly demands that Ukraine concede this critical defensive position, which Russian forces currently have no means of rapidly enveloping or penetrating, apparently in exchange for nothing. The precise terms of Putin's position remain unclear as of August 9; however, Trump Administration officials, particularly US Special Envoy for the Middle East Steve Witkoff, have offered four different presentations of Putin's terms.The fortress belt is made up of four large cities and several towns and settlements that run north to south along the H-20 Kostyantynivka-Slovyansk highway, with a total pre-war population of over 380,537 people. The belt is 50 kilometers long (roughly 31 miles, about the distance between Washington, D.C., and Baltimore, Maryland).
Ukraine has spent the last 11 years pouring time, money, and effort into reinforcing the fortress belt and establishing significant defense industrial and defensive infrastructure in and around these cities.

Slovyansk and Kramatorsk form the northern half of the fortress belt and serve as significant logistics hubs for Ukrainian forces defending in Donetsk Oblast. Druzhkivka, Oleksiyevo-Druzhkivka, and Kostyantynivka serve as the southern half of the fortress belt.
Ukrainian forces first began building up defensive positions in and around these cities after retaking them from pro-Russian proxy forces who attacked and seized Slovyansk, Kramatorsk, Druzhkivka, and Kostyantynivka in April 2014.
Russia's failure to seize Slovyansk in 2022 and ongoing struggles to envelop the fortress belt underscore the success of Ukraine's long-term efforts to reinforce the fortress belt cities.
Russian forces are currently still attempting to envelop the fortress belt from the southwest and are engaged in an effort to seize it that would likely take several years to complete.

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