U.S. told Russia that Crocus City Hall was possible target of attack
More than two weeks before terrorists staged a bloody attack in the suburbs of Moscow, the U.S. government told Russian officials that Crocus City Hall, a popular concert venue, was a potential target, according to U.S. officials familiar with the matter.
The high degree of specificity conveyed in the warning underscores Washington’s confidence that the Islamic State was preparing an attack that threatened large numbers of civilians, and it directly contradicts Moscow’s claims that the U.S. warnings were too general to help preempt the assault.
I still think Putin deliberately allowed it.
I think US deliberately withheld crucial info.
Current theory is that, Ukrainians hired ISIS-K to do the teract on March 7-8 during Shaman concert in the Crocus Hall.
Shaman is extremely popular patriotic singer in Russia, so it's natural and typical for ukro-regime to do something like that.
So they employed their Central Asia ISIS-K contacts for that. US intercepted ISIS communication and "informed" Russians.
Russians increased security at the concert and terrorists decided to skip/delay it. Then Ukro-regime cancelled the whole thing because they wanted Shaman concert specifically. But ISIS-K decided to do it anyway 2 weeks later.
How much US intelligence knew? Some of their claims imply that they knew the place and time, that is consistent with their public warning mentioning only 2 days and "concerts"