Some of us worked in the cellular network industry.So many experts on here. I'm so privileged.
About security: you don't need a foreign country to get into security issue. We can do that locally with criminals. We can flood our whatever it is if they are not setup correctly, and we will get in trouble because of cheap carriers not setup their network and oversold bandwidth.
You would be stupid to let your critical network be hooked into the public domain. Most critical network are completely off grid for virus and bit locker ransom ware risk already. Most of those machines also do not accept USB or whatever connection as well if you want them to be secure (because that's how Iran's centrifuge got destroyed what "someone" inject 4 zero day exploits to screw up their control loop, and hide their tracks until Eastern Europeans found it later).
About foreign infiltration risk: deal with it, we are going to see them from foreigners trying to get in just like they are going to see us trying to get into theirs. This is the nature of national security among nations. This is like how we lock our houses door and our cars instead of just let anyone get in and out. This is the nature of things and this is how we are going to go into the future between nations, between companies, between people even within the families (with facial recognition instead of telling each other our passwords). Nothing new here, we will do our best to lock up just like they will do their best to lock up.
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