> The USA cannot do it, because there is actually a law against cutting off communications systems dating back to 1944. Of course there have been attempts to make it possible.

The link you provided says:

In 1942, during World War II, Congress created a law to grant President Franklin D. Roosevelt or his successors the power to temporarily shut down any potentially vulnerable technological communications technologies.

The Unplug the Internet Kill Switch Act would reverse the 1942 law and prevent the president from shutting down any communications technology during wartime, including the internet.

The House version was introduced on September 22 as bill number H.R. 8336, by Rep. Tulsi Gabbard (D-HI2). The Senate version was introduced the same day as bill number S. 4646, by Sen. Rand Paul (R-KY).

The bill did not pass and did not become law. So what are you referring to?