Russian Security Services Had Advance Knowledge of ISIS Threat Before Moscow Concert Attack

TL;DR
Russian intelligence documents obtained by a UK-based investigative organization suggest that the Kremlin's security services were aware of an ISIS threat days before a deadly attack on a concert hall near Moscow, where at least 143 people were killed. The documents indicate that ethnic Tajiks radicalized by ISIS-K could have been involved in the attack. Despite warnings from the United States, Russian President Vladimir Putin dismissed the American warnings as "provocative" and suggested, without evidence, that Ukraine had helped orchestrate the attack.
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