But the company's presence has sparked fears of Chinese espionage, with Defence Secretary Gavin Williamson warning a year ago he had "very deep concerns" about the firm's role in the UK. In an interview last month, Andrus Ansip, European Commission vice president for digital affairs, said China's National Intelligence Law, passed in 2017, has increased the risk in dealing with Chinese companies in Europe.
Addressing a question from British lawmakers about whether Huawei could be compelled to assist China's government in spying on the UK, Ding said in the letter the company "has never and will never" use its equipment to assist espionage activities.
"It is a complicated and involved process, and will take at least three to five years to see tangible results. We would not do this is any country", he wrote.
A spokesman from the National Security Council advised that the U.S.is "working across government and with our allies and like-minded partners to mitigate risk in the deployment of 5G and other communications infrastructure". We choose to ensure security'.
The Chinese telecoms firm has already pledged to spend $2bn (£1.5bn) addressing the security concerns outlined in the National Cyber Security Centre's (NCSC) annual report.
The government now has no own information on whether the Chinese company could be a security threat, Altmaier was quoted as saying, adding that the Federal Office for Information Security (BSI) had been activated.
Should the ban on Chinese networking hardware go into full effect, the statement indicates that there will be great pressure on Europe to follow suit in avoiding the use of Chinese cellular equipment.
He said that while some countries - including New Zealand, Australia and the U.S. - had "indeed taken measures to restrict Huawei business activities", some of the restrictions had been "exaggerated or even misinterpreted by the media".
Its chief financial officer Meng Wanzhou was arrested in Canada in December at Washington's request.
Separately the US Justice Department has charged Huawei with conspiring to violate US sanctions on Iran and with stealing robotic technology from T-Mobile US.
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