A new development in Ukrainian war: an FPV kamikaze drone controlled through fiber-optic cable

The most common countermeasures against FPV drones and loitering munition are jammer units placed above important targets or encapsulated as backpack omnidirectional jammer systems for infantry units. These devices jam the command and/or the drone's video link up to the point of losing the communication feeds. As a direct result, the drone operator cannot see (the real-time video transmission) and guide the drone to make immediate decisions and corrections on the fly, especially on the last part of the drone's flight path. But this approach begins to be no longer feasible.

Why? You can find a potential answer in this video.