Could be standard operating procedure to mine all crossings in those areas in danger of a counter offensive, while Russia is certainly adapting to the new drones everywhere reality its often still doing so very slowly.
people who know stuff about russian in dept defence could probably tell us.
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Explosives under railroad bridge exploded after drone strike by Sky Riders unit of the 116th mechanized brigade.
people who know stuff about russian in dept defence could probably tell us.
Mossad is probably better, but they are way up at the Highscore.