If cyberspace isn't a "place" then where are we fighting? This global commons/contested commons argument loses some steam when you remember that nation-states do regulate use of the electromagnetic spectrum. So there already is some idea of sovereignty, and it is in the context of the existing (physical) domains. Even via space, sovereignty is established via the orbiting platforms. Also, SATCOM transmissions cannot "land" without "landing rights". So the case for this new, unique "domain" is hardly concrete.
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