Duty to warn guided US advance warning of the Moscow attack. Adversaries dont always listen WSB-TV Channel 2 [Video]

WASHINGTON — (AP) — The U.S. warning to Russia couldn’t have been plainer: Two weeks before the deadliest attack in Russia in years, Americans had publicly and privately advised President Vladimir Putin’s government that “extremists” had “imminent plans” for just such slaughter.

The United States shared those advance intelligence indications under a tenet of the U.S. intelligence community called the “duty to warn,” which obliges U.S. intelligence officials to lean toward sharing knowledge of a dire threat if conditions allow. That holds whether the targets are allies, adversaries or somewhere in between.

There’s little sign Russia acted to try to head off Friday’s attack at a concert hall on Moscow’s edge, which killed more than 130 people. The Islamic State’s affiliate in Afghanistan claimed responsibility, and the U.S. said it has information backing up the extremist group’s claim.

John Kirby, the Biden administration’s national security spokesman, made clear that the warning shouldn’t be seen as a breakthrough …