Zhu Fenglian, spokeswoman for China’s Taiwan Affairs Office, said Beijing opposed "any official interaction between the US and China's Taiwan region." "This stance is clear and consistent. We urge the US to stick to the 'one China' principle," she said.
Beijing insists, if countries wish to have formal ties with China, that countries subscribe to the "one China" principle and therefore do not have full formal ties with Taiwan. The US, like most of the world, does adhere to this, albeit while simultaneously maintaining close relations with Taipei and not recognizing China's claim to the territory.