As Ukraine’s counteroffensive has rumbled forward in recent months, it has encountered minefields and forces dug into elaborate trench networks. Ukraine’s forces have also run up against a Russian tactic of ceding ground before striking back. Reports on Monday illustrated the issue: Russian forces said they had staged an assault on Ukrainian troops on the front line in the Zaporizhzhia region, while Ukraine’s forces said it had “repelled the attacks.” Rather than holding a line of trenches at al