Actors, not soldiers: Agreed, it needs to be just a bit deeper but these Chechen boys look too clean to have been digging. Looks like these trenches were dug by an excavator and not by hand.
Not using terrain to your advantage: The Chechens don’t seem to use the lay of land to set up their fighting positions — which I see as a command failure — the design of the defence needs to be planned out during a commander’s recce.
Mistakes galore: I don’t see pre-dug machine gun positions or an obstacle plan to channel the enemy. Ideally, with any overhead cover, you need support beams and at least 2 to 4 layers of sandbags (to prevent penetration by air burst shell splinters. The Chechen boys will wish they dug as deep as I once did, when they are bracketed by Ukrainian artillery.
Point of comparison: In my active NS days, our command trench was deep enough that it had small stairs; and over 1,000 sandbags for the overhead cover. All approaches had wire obstacles, with sentries, covering security forces and so on.
Learn by dying: They need to send more, as these war tourists are getting killed or injured in day 49 of Putin’s 3 day war.
More mistakes: Effective suppression is required as long as an RPG gunner is in a hot position.