"This could in the future jeopardise nimble cooperation and some sharing of information".
Huawei, the Chinese company that makes the tower technology, is shunned by the major USA wireless carriers (including AT&T, which owns CNN parent company WarnerMedia) and the federal government over national security concerns.
The warning was outlined in a letter from US Ambassador to Germany Richard A. Grenell, according to a report from the WSJ.
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ETIAS is a border control system created by the European Commission, which works to secure borders around the EU. Minors, the website said, will still only need their normal passports to travel after the visas go into effect.
The U.S. government warned Germany it might limit intelligence sharing if Germany uses Huawei's equipment in its 5G network, the Journal reported.
The central concern appears to be that if Huawei networking gear is used in German 5G networks, then they will no longer be secure against Chinese intrusion.
Germany's potential use of Huawei in its 5G rollout is a sticking point for the US.
Grenell said in his letter that Chinese companies, under Chinese law, can be required to support China's security agencies and that inspections of Huawei software could not ensure there were no vulnerabilities, the newspaper said.
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"The Federal Minister for Economic Affairs and Energy has indeed received a letter", German embassy in DC spokesman Matthias Wehler told CNN.
The U.S. has been pushing back against China's technological expansion by asking that other countries refuse to adopt Huawei's 5G infrastructure, which Washington says poses security threats.
The Chinese telecoms behemoth has strenuously denied the espionage allegations. Further, the USA likely needs its allies to support the pushback against Huawei in order for the isolation tactic to have any meaningful effect.
The year ended with the arrest of Huawei's chief financial officer in Canada at USA request, to the consternation of China.
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The royal couple visited Commonwealth countries for their first oversees tour previous year . However, she was able to meld both Canadian and British for.