Ukraine has established a kill zone along the front, which makes it extremely difficult for the Russians to advance. Russians call it a drone zone, which extends 10 to 15 kilometers along the frontline.

Essentially, within this drone zone, it is nearly impossible for the Russians to move except on foot and at night. And even then, they become targets.

Ukraine has made drones its key defensive asset.
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@Free_Press Once Upon A Time Ukrainians used to come to the UK to be trained in drone warfare. One rather suspects that the traffic is the other way round these days.