The armoured vehicle skids to a halt in front of the trench and out bursts half a dozen Ukrainian soldiers. Within seconds, smoke grenades obscure the scene, and the sound of gunshots rips through the air. The clear blue sky makes it easier for the Ukrainians to hear the drone flying dozens of metres overhead but confusion ensues: is the drone commandeered by one of their own or by the enemy? A Ukrainian soldier briefly shoots at it but then shifts his focus instead to the 200 metres of trench lying ahead. Speed, here, is of the essence. Thirty minutes later, the Ukrainians have safely detonat…