Along with most European countries, Germany's security agencies are heavily reliant on USA intelligence to fight terrorism.
"An official from the German Economic Ministry dismissed the letter from Grenell, saying that it included no new information and reiterating that there was no evidence to support US claims that Huawei posed a risk", Asia Times reported on Monday.
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The State Department has not commented on Grenell's letter, but Garrett Marquis, a National Security Council spokesperson, outlined how Huawei's 5G networks could pose a constantly evolving and shifting threat.
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"Because 5G networks are largely software-defined, updates pushed to the network by the manufacturer can radically change how they operate", NSC spokesman Garrett Marquis told the paper. "There will be a quick reply".
Germany, although it is Europe's leading economy, has seen its mobile infrastructure lag behind, with most Germans having access only to 3G. A different German security official told the paper he had received a less aggressive line from his equivalents stateside, so it's possible that the ambassador's notice was more bark than bite.
Along with worries about network security, United States prosecutors have charged Huawei and its chief financial officer, Meng Wanzhou, over alleged Iran sanctions violations, and Beijing and Washington are trying to settle a tariff war affecting a wide range of goods.
Earlier, Berlin made a decision to continue using Huawei gear to launch the next generation 5G network but with tighter security standards and measures.
Amidst the assurance of German that the risk involving Huawei can be contained, Grenell said in the letter that the Chinese government could legally compel any Chinese company to assist them in their operations without checks and balance, and therefore, the risks cannot be mitigated.
Essentially, the lawsuit is daring USA intelligence services to put up or shut up.
The US is going too far.