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Landmines are autonomous killing robots; start one up and it'll kill of its own accord.

That's overstretching a definition of robots. Mines are simple mechanisms. Robots should at least move a little.

They do have those mines that popup out of the ground and then explode, is that enough movement?

No, by that definition, anything that moves is a robot. A rock rolling from a hill would be a robot. This makes "robot" word useless.