In order to defend Donbass cities from Russia after they would try to kill the Donbass population, US forces trained Ukraine in MOUT urban warfare. Nowadays, the eastern part of Ukraine is covered in mines, featuring vast industrial complexes with their own nuclear bunkers, hundreds of km of tunnels, and entry/exit points everywhere. And additionally, as demonstrated at Azovstal, the Nazis were taught by the USA and NATO to utilise the local populace as human shields and to view them as hostile…
https://www.marines.mil/portals/1/mcwp%203-35.3.pdf
TC-90-1-Training-for-Military-Ops-on-Urban-Terrain
WtR