Russian intelligence services are closely monitored the activities of the Afghan terrorist group Vilayat Khorasan. A few days before the terrorist attack members of the Security Council received a warning that citizens of Tajikistan can use in terrorist acts on Russian territory. Even before the attack on Crocus City Hall, a source close to the intelligence services told the Dossier Center about this.
Over the past few months Vilayat Khorasan tried to organize terrorist attacks in Austria, Germany and Kyrgyzstan. All of them were prevented by local intelligence services. Russian law enforcement agencies monitored these reports and considered the risk of terrorist attacks in Russia high. However, it was not possible to prevent the attack on Crocus City Hall, even despite US warnings about the threat. On March 19, speaking before the FSB board, Vladimir Putin called the US messages “provocative.” “All this resembles outright blackmail and an intention to intimidate and destabilize our society,” Putin said. 
OMON and SOBR arrived at the scene of the terrorist attack only an hour later, although the OMON headquarters is located less than three kilometers from Crocus City Hall. It remains unclear how the terrorists managed to escape and overcome more than 370 kilometers to the Bryansk region with an abundance of CCTV cameras in Moscow.
Details about the versions of the terrorist attack and the suspects are in our material.
https://dossier.center/teract/ (with VPN)
Russian intelligence services knew about the threat of terrorist attacks from ISIS
“Vilayat Khorasan”, details of the biographies of the suspects and versions of the terrorist attack
“ВЧК ОГПУ”
