The US, Brazil and some other countries have recognized Guaido's presidency, with US President Donald Trump warning that "all options are on the table".
The US government should urge relevant enterprises to adhere to the one-China principle and modify references to Taiwan on their website as soon as possible, Lu said at a daily news briefing.
The US government's 90-day extension "doesn't mean much".
The U.S. ambassador to the United Nations, Nikki Haley, said on Thursday that Washington would probably get out of the Iran nuclear deal and reimpose sanctions on the Islamic Republic.
The US has a list of European goods valued at billion for possible tariffs, and the EU has countered with a list of billion of US exports it could selectively target.
The UN Security Council will hold an emergency meeting on Tuesday in response to the ballistic missile test.
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The United States has not made the matter any better by flexing its muscles. On Wednesday, some 2,000 US and the Republic of Korea troops took part in a military drill just 30 kilometers south of the Demilitarized Zone, a day after the DPRK held its own artillery drill. The USS Carl Vinson and other warships are cruising toward the area in what US President Donald Trump earlier described as "an armada".
The United States has recorded more than 12,662,000 cases with more than 260,800 related deaths as of Wednesday afternoon, according to the real-time count kept by Johns Hopkins University.
The US-China Intelligent Robotics session invited executives from Chinese robotics companies and Silicon Valley-based AI companies to discuss collaboration opportunities in the areas of industrial robots and consumer robots, as well as Chinese market penetration of the US' leading AI companies such as Vicarious AI.
The United Kingdom is expected to grant a visa to a former employee of the UK consulate in Hong Kong who was released by Chinese mainland police, British newspaper The Telegraph reported.