>ts Ukraines by far strongest fortification on the frontlines atm.

If you look at the topographic map you'll see that Bahkmut is in the low ground, theres defensive positions behind Bahkmut that at 100m+ higher. If Russia finally manages to take Bahkmut they'll get shot to shit from those positions anyway and then it's an uphill battle trying to push out of the town.

https://en-us.topographic-map.com/map-llpwzs/Bakhmut/