Huawei said billions of customers around the world could be harmed by the company's U.S. sanctions-as it launched a legal challenge against some of the restrictions.
The chief legal officer of the Chinese telecoms giant, Song Liuping, accused Washington of setting a "dangerous precedent" and said that there was "no gun, no smoke, only speculation" behind the claim that it posed a security risk.
Huawei was placed on a blacklist earlier this month, banning US firms from doing business with it, in a move that prompted disruption to the tech sector immediately.
The company is the largest global network equipment manufacturer, but is now struggling to keep access to major markets as it rolls out 5 G technology of the next generation.
Mr Song said the decision to put it on a blacklist "threatens to harm our customers in more than 170 countries, including over 3 billion customers worldwide who use Huawei products and services."
He spoke as Huawei filed a U.S. court motion against a separate restriction passed by last summer's U.S. congress, banning federal agencies and their contractors from using Huawei equipment on security grounds-citing their ties with the Chinese government.
Mr Song told reporters at Shenzhen's Huawei headquarters that the company's "state-sanctioned campaign" would not improve cyber security.
He said: "Politicians in the U.S. are using the strength of a whole nation to come after a private company. That's not normal." Accusing the U.S. of setting a "dangerous precedent," he added: "Today it's telecommunications and Huawei. Tomorrow it could be your industry, your company, your consumers." Huawei's American blacklist has a big impact because the company relies heavily on U.S. components.
An initial 90-day reply from the ban was given to the company.
But the sanctions have already affected Google's partnership-which has said it will continue to support existing Huawei smartphones, but future devices will not carry its flagship apps and services including maps, Gmail and its search engine.
The restrictions come at a time when the US and China are engulfed in a bitter trade dispute, with tariffs on billions of pounds worth of goods on both sides hiking.
Central to the dispute is the claim of US President Donald Trump that China is stealing technology from foreign firms and unfairly subsidizing Chinese firms.
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