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Prime Minister Boris Johnson on Jan. 27. Photo: Daniel Leal-Olivas-WPA Pool/Getty Images

The United Kingdom on Tuesday announced Chinese telecommunications giant Huawei will build part of the country's next generation 5G mobile networks.

Why it matters: The United States along with numerous Conservative MPs have repeatedly warned the U.K. that Huawei is a national security risk, claiming that China could use its equipment for espionage. It's a sign the U.S. campaign against Huawei is faltering as allies open their markets.

Details: The U.K. government said Huawei will have access to "non-core" parts of the country's network but will be banned from "sensitive locations" such as military or nuclear sites.

  • Huawei’s overall share of U.K.'s 5G market will be capped at 35%. The cap will also "be kept under review to determine whether it should be further reduced as the market diversifies," the government said.

The big picture: Axios' Jonathan Swan reports that the decision could lead to the U.S. government curtailing the intelligence it shares with its closest ally.

  • British Prime Minister Boris Johnson on Monday said he would never jeopardize Britain’s security relationships, the Telegraph reports.

What they're saying: A senior Trump administration official told Axios' Jonathan Swan, "The United States is disappointed by the U.K.'s decision. There is no safe option for untrusted vendors to control any part of a 5G network."

  • "We look forward to working with the U.K. on a way forward that results in the exclusion of untrusted vendor components from 5G networks. We continue to urge all countries to carefully assess the long-term national security and economic impacts of allowing untrusted vendors access to important 5G network infrastructure."

Go deeper:

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21 mins ago - Science

NASA's Mars helicopter is a test for the future of space exploration

Ingenuity (left) with Perseverance on Mars. Photo: NASA/JPL-Caltech/MSSS

NASA is set to fly the first test flight of its tiny Ingenuity helicopter on Mars Sunday, marking the advent of drones for space exploration.

Why it matters: If successful, this flight will be the first time a human-built aircraft has flown on a world other than Earth, opening the door to new means of exploring planets far from our own.

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1 hour ago - Politics & Policy

The global future is looking dark and stormy

Illustration: Rae Cook/Axios

A new 20-year-forecast for the world: increasingly fragmented and turbulent.

The big picture: A major report put out this week by the National Intelligence Council reflects a present rocked by the COVID-19 pandemic. How the next two decades will unfold depends largely on whether new technologies will ultimately unite us — or continue to divide us.

11 hours ago - Politics & Policy

Rep. Gaetz declares he's "not going anywhere" amid sex trafficking probe

Rep. Matt Gaetz. Photo: Eva Marie Uzcategui/Bloomberg via Getty Images

Rep. Matt Gaetz (R-Fla.) doubled down Friday night, saying he's not "going anywhere," and vowing, "I have not yet begun to fight," amid a federal investigation into sex trafficking allegations.

What he's saying: “I’m built for the battle, and I’m not going anywhere,” Gaetz, who denies the allegations, said during a Women for America First event at the Trump National Doral Miami resort.