We don't have to sever all the transoceanic cables to protect sensitive networks from foreign intrusion, we just have to stop plugging them into the Internet in the first place.
Which is, itself, Balkanization. It also entirely defeats the idea of having a domestic Internet in the first place. Do you not know of anyone who VPNs into their work intranet over the public Internet? Even the government does that.
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We don't have to sever all the transoceanic cables to protect sensitive networks from foreign intrusion, we just have to stop plugging them into the Internet in the first place.
Which is, itself, Balkanization. It also entirely defeats the idea of having a domestic Internet in the first place. Do you not know of anyone who VPNs into their work intranet over the public Internet? Even the government does that.