China has slammed a decision by the US government to put telecom equipment giant Huawei on a blacklist and promised to take steps to protect its companies in a further test of ties between the economic heavyweights.
China is strongly against other countries imposing unilateral sanctions on Chinese entities, a Commerce Ministry spokesman said, stressing the US should avoid further damaging bilateral trade relations.
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The crackdown on Huawei came as US Treasury Secretary Steven Mnuchin said he would visit China soon for more trade talks.
Hopes for a deal to end their trade war have been thrown into doubt after the world's two biggest economies raised tariffs on each other's goods this week.
The US Commerce Department said on Wednesday it was adding Huawei Technologies Co and 70 affiliates to its so-called "Entity List" in a move that bans the Chinese company from acquiring components and technology from US firms without prior US government approval.
President Donald Trump separately signed an executive order barring US firms from using telecom equipment made by companies deemed to pose a national security risk.
The order did not specifically identify any country or company, but US officials have previously labelled Huawei a "threat" and lobbied allies not to use Huawei network equipment in next-generation 5G networks.
"China has emphasised many times that the concept of national security should not be abused, and that it should not be used as a tool for trade protectionism," Gao Feng, spokesman at the Chinese commerce ministry, told reporters.
"China will take all the necessary measures to resolutely safeguard the legitimate rights of Chinese firms."
US Commerce Secretary Wilbur Ross said Trump backed the decision to "prevent American technology from being used by foreign-owned entities in ways that potentially undermine US national security or foreign policy interests."
In response, Huawei, which denies its products pose a security threat, said it was "ready and willing to engage with the US government and come up with effective measures to ensure product security".
It said restricting Huawei from doing business in the US would "limit the US to inferior yet more expensive alternatives, leaving the US lagging behind in 5G deployment and eventually harming the interests of US companies and consumers".
The sanctions on Huawei were also likely to have ramifications beyond the company itself, rattling the global tech supply chain, analysts said.
China is also angry about Canada's arrest of Huawei Chief Financial Officer Meng Wanzhou in December. Meng faces extradition to the United States on charges that she conspired to defraud global banks about Huawei's relationship with a company operating in Iran. She and the company deny the charges.
Also on Thursday, China's Foreign Ministry announced the formal arrest of two Canadian citizens who have been detained shortly after Meng's arrest.
Trump had softened his trade rhetoric on Tuesday and insisted talks had not collapsed. He also announced plans to meet Chinese President Xi Jinping at a G20 summit in Japan late next month.