Published 12 April 2014 by the BBC. This is at the start of the Donbass war, in Slovyansk, the first city to fall to the rebels. The video explains how the civilian population defeated the Ukrainian army. There is an admission of Ukrainian commander at 2:10

Despite being liberated in 2014 and being the heart of the revolution in Donbass, Ukraine recaptured it after an almost 3 month long siege and retains it to this day.

New York Times article on the aftermath of the siege: https://archive.is/qYLRu