If this is the level of entrenchments that Russia has dug than they should be preparing either withdrawals or more mass burials. The bare minimum of trench digging, waist high, unsupported and with faint zig-zagging. The amount of bodies littering those shallow trenches is quite high evidencing that they offer little cover from modern drone-spotted precision fires.
M67's
At one point it looks like they are trying to duel it out with a mortar section. Guns stopped having volley sights for a reason you know!