An interesting video recorded through a tank periscope, claims to be capturing the moments a Ukrainian tank was engaging Russian armor.

Although these claims cannot be confirmed, we could assume that this tank commander is obliterating the opposition, hence why there is no return fire from said target (don't get your panties in a bunch, it's a joke). All jokes aside, many armored vehicles have several of these periscopes mounted throughout the vehicle, some more than others.

Judging by the position of the barrel, I'd say it's safe to assume the driver is doing the recording of the footage. Before you ask, yes... the driver looks through this small set of periscopes to drive a massive tank. Based on the technological advances, many modern armored vehicles are equipped with Driver Vision Enhancer (DVE's), that allow the driver to rely less on the track commander (TC), further allowing the TC to focus more on engaging the enemy.

Now on the flip side of that, I have no idea if Ukraine or Russia have these advancements in their armored vehicles yet. From my quick look through google, I couldn't find anything discussing Russian tanks being equipped with this technology; however they could use a different acronym for these systems. If you're a tank guy and know more than me (not that difficult to achieve), let me know in the comments below.