American intelligence withheld information on Moscow terror attacks out of fear of exposing intelligence sources or methods
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Why Russia’s Vast Security Services Fell Short on Deadly Attack
https://www.nytimes.com/2024/03/28/world/europe/russia-concert-attack-security-failures.html
The factors behind the failure to prevent a terrorist attack include a distrust of foreign intelligence, a focus on Ukraine and a distracting political crackdown at home.
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.