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This would unironically completely blunt an entire VDV division with massive casualties to the attacker, based on what we have seen of Russian capabilities. The burning Russian convoys of Kiev faced no prepared defenses at all and were annihilated and sent retreating after a few days.
Moreover based on Russian capabilities, they would eventually capture this trench but it would take around 16 months of daily human wave attacks and 50,000 casualties, capturing it only after the poles have run out of ammunition.