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You assume the intent is to defend itself against espionage, not as a tactic as part of a tradewar.

If the US is truly concerned about espionage, why is some Chinese electronics manufacturing for US export okay, while others are not?

All of these things are interlinked and the tradewar is absolutely part of it.

Certain types of technology will make espionage easier for China on US citizens than the other way around. They are just battling over rules of war.