The U.S. company can ask the Chinese company to withdraw its products from the U.S. market and file an international lawsuit to revoke the Chinese patent. The premise is that the U.S. company’s application date is earlier than China’s, which means that someone else invented it first. , the basis of the lawsuit is that this product was born before you applied, so your original invention was not novel and the patent office should withdraw it. I don’t know the place of prosecution either. If American companies find it too troublesome and don't litigate, then at least you can still have patent rights in the Chinese market