Britain has already called the Trump administration’s bluff, betting that officials would back away from their threat to cut off intelligence sharing with any country that used Huawei equipment in its network. Apart from an angry phone call between President Trump and Prime Minister Boris Johnson, Britain appears to be paying no price for its decision to let Huawei into limited parts of its network, under what the British say will be rigorous surveillance.

Germany now appears ready to follow a similar path, despite an endless stream of cajoling and threats by Secretary of State Mike Pompeo, Defense Secretary Mark T. Esper and other U.S. officials at a global security conference in Munich last weekend.

In public speeches and private conversations, Mr. Pompeo and Mr. Esper continued to hammer home the dangers of letting a Chinese firm into networks that control critical communications, saying it would give the Chinese government the ability to spy on — or, in times of conflict, turn off — those networks. The security risks are so severe, they warned, that the United States would no longer be able to share intelligence with any country whose network uses Huawei.