Leaked U.S. officials' chat on Yemen operation alarms allies, raising security concerns.

A leaked group chat between U.S. officials discussing a military operation in Yemen, which accidentally included a journalist, has alarmed America's allies. The conversation on the Signal app raised concerns about the security of sensitive information and the reliability of the U.S. as a partner. European reactions ranged from surprise to amusement, highlighting questions about U.S. security practices and the implications for international relations.