In a thicket of trees between two vast farm fields, a plywood trapdoor built into the forest floor opened to reveal stairs leading underground.Inside was a subterranean bunker, cut into the black earth, where Ukrainian troops from a mortar unit awaited coordinates for their next target.The men squeezed past one another down a shoulder-width dirt corridor lit with LED strips, staring at tablet computers showing a live drone feed of the terrain outside.
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