In this photo released by Russian Emergency Ministry Press Service on March 23, 2024, firefighters work in the burned concert hall after an attack on the building of the Crocus City Hall on the western edge of Moscow, Russia. A little-known U.S. intelligence principle called the "duty to warn" came into play ahead of the deadly attack on Moscow's outskirts. U.S. officials invoked that duty when warning Russian officials a full two weeks before Friday's attack. Just three days before the attack, Russian President Vladimir Putin dismissed such Western warnings as provocations. (Russian Emergency Ministry Press Service via AP)
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