Shield.

This is coolbert.

Regard this to be concealment, rather than cover. Russian trenches no observation of troops within possible

Cover:  Protection from fire of the enemy weapons.  It may be natural or artificial.

Concealment:  Concealment is anything that hides an individual, his position, unit, or equipment from enemy observation.  It may be natural or artificial.  Remember that concealment is not protection from enemy fire.

"Russia installed trench ceilings in Ukraine to hide troop movements"

 From  https://bulgarianmilitary.com  | By Boyko Nikolov | Dec 11, 2023.

"New photos emerging from Ukrainian sources reveal significant structural modifications to Russian trenches in Ukraine. These changes, characterized by the inclusion of frames and actual ceilings in the trenches, aim to guard against the prying eyes of Ukraine’s FPV drones." 

"However, don’t be fooled. The intentions behind these trench innovations differ substantially from the common aircraft enhancements, such as tires on fuselages or armor’s cope cages. In fact, this basic design is not meant to dissipate the accumulated energy of an FPV drone upon impact." 

"The primary goal of these additional bars and roofs in the trenches is more strategic in nature. They serve as a visual shield against Ukrainian drone operators, effectively concealing the movement of Russian troops within the trenches. By doing so, they aim to disrupt targeted drone strikes, offering a layer of tactical protection."

Overhead concealment does have a virtue to it. Russian soldiers will be allowed lateral movement within the trench system, sans observation from the Ukrainian drones. A Russian attack will be able to focus it's energy  without Ukrainian defender, being aware. The Ukrainian defender having dissipated energy while Russian able to focus his energy

coolbert.