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Taiwan and China's economies heavily rely on each other. I won't be surprised if Taiwan companies are still sending chips or technologies to China.

There is no sanction preventing Taiwan from trading with mainland China. In fact it's their largest export market.

Once there, those chips are used to build Western-branded products, Chinese-branded products and some, I'm sure, are re-exported to Russia.

The chips go to China regardless since most US technology is assembled in China.