Moscow attack: 'Duty to warn' guided US advance warning of the Moscow attack. Adversaries don't always listen
The U.S. has shared intelligence warnings to Russia, including the recent attack at a concert hall in Moscow, under the "duty to warn" tenet of the U.S. intelligence community. This duty is aimed at sharing knowledge of a dire threat if conditions allow, whether it's allies, adversaries, or somewhere in between. There's little sign that Russia acted to head off Friday's attack, which killed more than 130 people.
Source: indiatimes.com
