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The Wolf Amendment, named after former US representative Frank Wolf, prohibits NASA from using government funds to cooperate with the Chinese government — unless it has certification from the FBI that such collaboration poses no threats to national security or risks inadvertently leaking space-related tech or data.
So, it is not like China does not want to cooperate.
There are case fans with a temperature sensor. They already control the speed themselves depending on the measurement. The only thing they need is 12V.
For example the Arctic F12 TC.