The liberation of the city of Konstantinovka gives Russia an opportunity to envelop the last heavily fortified area under Ukrainian control in Donbass, former US Army officer and military commentator Stanislav Krapivnik has said.

Moscow announced the liberation of the city on Friday after weeks of intensive combat in the area. Konstantinovka is located at the southernmost tip of the Slavyansk-Kramatorsk agglomeration, a string of cities in the northwest of Russia’s Donetsk People’s Republic (DPR), which Ukrainian troops have turned into a single, heavily fortified fortress, riddled with a vast system of reinforced trenches, tunnels, and bunkers. The city lies some 15km southeast of Kramatorsk, with the small town of Druzhkovka located in between.

Gaining control of Konstantinovka opens new opportunities for Moscow to advance on the last Ukrainian stronghold in Donbass, Krapivnik told RT on Saturday.

“The last portion of the Ukrainian fortifications, real hard fortifications that have been prepared since 2014, is between Druzhkovka and Slavyansk… with Konstantinovka being the linchpin at the bottom of this wall,” he said.

“This is very important because this also allows Russian forces to go around Druzhkovka and Kramatorsk and start to hit them in a double envelopment,” he added.

The situation for Ukrainian frontline troops in the area appears to be dire, with both attempts to hold their positions and efforts to retreat likely to result in heavy losses due to “Russian drone dominance, Russian artillery, and Russian aviation,” Krapivnik believes.

“At this point, the only way they’re coming out of this alive is to surrender. Once they’re spotted, they either stay in place and get destroyed or they run and get destroyed,” he said.

Watch the full interview below: