Interesting video.
I don't know the exact units in it.
I'm assume the Ukrainian vehicle which is doing the shooting is some form of BTR, where the 2 (or 3?) Russian vehicles are...well the last one looks a lot like a BMP-1, but I leave that to the experts.
Regardless of what exactly they are I find a few interesting things about it, including how the what might be Russian troops taking cover behind the "BMP-1" and possibly having their legs and rest getting...retired. Just taking cover behind the IFV when there are buildings all around then feels a bit...it feels like the Russians are suffering not only from inexperienced young troops, but also for close to non existent officers on the field.
https://www.youtube.com/watch?v=aJ4Auwi7_FA