China's ambassador to the UK has called Britain's decision to ban telecoms giant Huawei from its 5G network "disappointing and wrong".
The UK government has ordered companies to strip equipment from Huawei out of the system by 2027.
It follows sanctions imposed by the US, which claims the Chinese firm poses a national security threat - something Huawei denies.
US President Trump welcomed the UK decision, calling Huawei "unsafe".
"We convinced many countries, many countries - and I did this myself for the most part - not to use Huawei because we think it's an unsafe security risk, it's a big security risk," he said.
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Mr Trump made the comments as he attempted to increase pressure on Beijing by announcing an executive order ending preferential treatment for Hong Kong in response to a new security law brought in by China.
In response to the 5G network ban, Chinese ambassador Liu Xiaoming questioned whether the UK can provide a "fair" business environment for foreign firms.
"Disappointing and wrong decision by the UK on Huawei," he tweeted.
"It has become questionable whether the UK can provide an open, fair and non-discriminatory business environment for companies from other countries."
Huawei's chief security officer in the US, Andy Purdy, said the move was "very bad news for Huawei" but that the UK would suffer an "even greater negative impact" both financially and on the "equality of service between rural Britain and urban Britain".
He told BBC Radio 4's Today programme that Huawei hopes the UK government will reconsider its decision, and offered "additional information" to give ministers "the level of confidence that has been shaken" by the US government's sanctions.
Huawei's UK communications director Ed Brewster told BBC's Newsnight the ban had been announced "because of the pressure from the US".
"I think this is clear this is not about security, this is about trade. This is a US campaign focused on attacking our business and attacking the technology and that is because the US is behind on the technology," he said.
"We are in a long-term... trade dispute escalation from the US around how it wants to retain technology leadership."
Mr Brewster also moved to distance the company from the perception that it is an arm of the Chinese state, adding: "We don't work for governments, we work for the telecoms networks."
Huawei has repeatedly said it would not cause harm to any country.
What does the ban involve?
The UK's mobile providers are being banned from buying new Huawei 5G equipment after 31 December, and they must also remove all the Chinese firm's 5G kit from their networks by 2027.
The decision came after the UK's National Cyber Security Centre (NCSC) warned that highly restrictive US sanctions meant the security of Huawei's equipment could not be guaranteed.
Announcing the ban to the House of Commons on Tuesday, Digital Secretary Oliver Dowden said it had not been an easy decision but was the right one for UK telecoms networks, national security and the UK economy.
He said the move would delay the country's 5G rollout by a year and the cumulative cost, when coupled with earlier restrictions announced against Huawei, would be up to £2bn.
5G technology promises faster internet speeds and the capacity to support more wireless devices, which should be a boon to everything from mobile gaming to higher-quality video streams. 5G connections are already available in dozens of UK cities and towns, but coverage can be sparse.
The UK last reviewed Huawei's role in its telecoms infrastructure in January, when it was decided to let the company remain a supplier but introduced a cap on its market share.
But in May the US introduced new sanctions designed to disrupt Huawei's ability to get its own chips manufactured.
The Trump administration claims that Huawei provides a gateway for China to spy on and potentially attack countries that use its equipment, suggestions the company strongly rejects.
The US has called for members of the Five Eyes alliance - which also includes the UK, Canada, Australia and New Zealand - to avoid Huawei kit.
Source: BBC