The adversarial relationship between Washington and Moscow prevented U.S. officials from sharing any information about the plot beyond what was necessary, out of fear Russian authorities might learn their intelligence sources or methods.
The adversarial relationship between Washington and Moscow prevented U.S. officials from sharing any information about the plot beyond what was necessary, out of fear Russian authorities might learn their intelligence sources or methods.
I stay with "fear of exposing intelligence". There is no need to fear something that does not exist