How do you know rulers of China, Russia and USA aren’t best friends ever and share information at top levels? You simply cannot trust a third party vendor anymo

How do you know rulers of China, Russia and USA aren’t best friends ever and share information at top levels? You simply cannot trust a third party vendor anymore, no matter where they reside and this includes your cpu too. Any information that needs security from nation state level requires physical data diodes. I guess you can use the method you mentioned for protection against lower level actors.