U.S. chief technology officer Michael Kratsios on Thursday criticised countries that "open their arms" to Chinese 5G networks and artificial intelligence technologies.
Kratsios singled out Huawei. saying Chinese firms cannot be trusted. He believes this because of laws compelling them to cooperate with their country's intelligence services.
Speaking at a tech conference in Lisbon, Kratsios said Europe must "take a stand" with America. The U.S. imposed export controls on Huawei in May. They also urged EU countries not to use its products.
"We may not see eye to eye on every aspect of technology policy, but we all agree on the principles that matter most," said Kratsios. He helps shape U.S. policies on technology and data.
Yet European companies do not seem deterred by Washington's concerns. Of 65 commercial deals that Huawei has signed, half are with European customers building 5G networks, the company said last month.
EU lawmakers avoided explicitly singling out China and Huawei as security risks. This is in a recent report on the danger of increased cyber attacks by state-backed entities.
Kratsios met Europe's antitrust chief Margrethe Vestager earlier in the day to discuss "digital issues", a European Commission official said.
In his speech, Kratsios reiterated allegations published by Le Monde last year. These said that Beijing had transferred data from the African Union's headquarters in Addis Ababa to China for five years using Huawei IT equipment.
The $200 million (£156.04 million) building was fully funded and built by China in 2012.
Huawei condemned Kratsios' comments as "hypocritical and manifestly false", stating that it did not have access to African Union data.
The African Union has previously rejected claims that Huawei was involved in any cyber security breach.
Source: Reuters 7 November, Lisbon
Reporting: Victoria Waldersee