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Doing anything remotely means using radio signals to control the thing, and that becomes the main weakness: radio signals can be jammed. You could try other means of communication, like lasers, though, but those too have their own weaknesses.



line of sight laser pulses would work.


Lasers are not all-weather systems.

In fact, as far as I know, they are a one-weather system: clear.


Cables.


Wire guided ordonance exists since th 70s, torpedoes, missiles...


The Germans had wire guided missiles in WW2.




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