Britain will allow Chinese telecommunications giant Huawei to play a limited role in its next generation 5G mobile networks, defying pressure from the U.S. CNBC's "Squawk Box" crew discuss.

Britain will allow Chinese telecommunications giant Huawei to play a limited role in its next generation 5G mobile networks.

The U.K. government said that Huawei will be restricted from being involved in “sensitive functions” in a network of features labeled as “core.”

There is also a limit in place on how much equipment networks can buy from one “high risk vendor” for a particular part of the infrastructure known as the Radio Access Network (RAN). This is essentially the part of the network that hooks up your devices with the actual 5G signal. So Huawei can participate in the RAN, but no more than 35% of a single vendor’s equipment in this part of the network can come from Huawei.

“The cap at 35% ensures the U.K. will not become nationally dependent on a high risk vendor while retaining competition in the market and allowing operators to continue to use two Radio Access Network (RAN) vendors,” the U.K.’s National Cyber Security Centre said in its review of the country’s telecommunications supply chain on Tuesday.

The move could strain relations between the U.K. and U.S. following a campaign by Washington to have the Chinese firm blocked from as many markets as possible. The U.S. claims Huawei poses a national security risk because its equipment could be used by Beijing for espionage. Politicians have also raised concerns about Huawei’s links to the Chinese Communist Party. Huawei has repeatedly denied these claims and any link to China’s government.

Huawei: Cap is a ‘significant limitation’

Huawei, which has already been blocked in other key markets including Australia and Japan, gave a measured response to the decision.

“Huawei is reassured by the U.K. government’s confirmation that we can continue working with our customers to keep the 5G roll-out on track. This evidence-based decision will result in a more advanced, more secure and more cost-effective telecoms infrastructure that is fit for the future. It gives the U.K. access to world-leading technology and ensures a competitive market,” Victor Zhang, vice president at Huawei, said in a statement.

Andy Purdy, the U.S. chief security officer at Huawei, said the U.K.’s decision was not necessarily a big win for the company, as the U.K. has always taken a measured approach since it began operating in the country over 15 years ago.

“Frankly, we don’t really see this as a win per se, this is a very small step and a process that began 15 years ago with the U.K., they have taken a very measured, a very somber approach to risk mitigation so they can get the benefits of technology,” Purdy told CNBC’s “Squawk Box” on Tuesday.

Purdy did say that the 35% cap is a “very significant limitation.”

US pressure

In the lead up to the decision, U.S. politicians pressured the U.K. to outright ban Huawei. Over the weekend, Secretary of State Mike Pompeo said Britain had a “momentous decision ahead on 5G” replying to British Conservative lawmaker Tom Tugendhat, who said: “The truth is that only nations able to protect their data will be sovereign.”

And there is also a risk that the intelligence sharing relationship between the U.S. and Britain is under threat. Earlier this month, a U.S. lawmaker has introduced a bill that would stop the United States from sharing intelligence with countries that use Huawei equipment for their 5G networks. That bill is not yet law.

5G technology is more than just faster download speeds on mobile devices. It promises to be able to underpin other new technologies like driverless cars for example. That’s why it’s viewed as being so crucial — because it could be the backbone for critical infrastructure in the future.

Some lawmakers in the Conservative government’s own party sent warnings to U.K. Prime Minster Boris Johnson.

“The danger is that you allow China leverage into your system, into your critical national infrastructure if you allow Huawei in,” Conservative lawmaker Bob Seely, told BBC Radio 4′s “Today” show on Tuesday.

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