This is the best summary I could come up with:

Internal Russian intelligence reporting that most likely circulated at the highest levels of the government warned of the increased likelihood of an attack in Russia by ethnic Tajiks radicalized by ISIS-K, according to information obtained by the Dossier Center, a London research organization, and reviewed by The New York Times.

But as Mr. Putin has advanced his political crackdown at home, its list of targets ballooned to include opposition figures like Aleksei A. Navalny, who died last month in a Russian prison, and his supporters, as well as L.G.B.T.Q.

is a political police force, and as such it reflects Kremlin concerns,” said Mark Galeotti, a specialist on Russia’s security operations and a senior associate fellow at the Royal United Services Institute in London.

Russia is one of the chief military backers of the Islamic State’s opponents in the Middle East, including Syria’s Bashar al-Assad, making Russian interests a key target of the Islamist extremist group.

The failure to prevent the attack was probably the result of a combination of other factors, including fatigue after being “especially alert” during the period before Russia’s recent presidential election, said a European security official, who tracks the activities of the Russian intelligence services.

Large terrorist attacks on Russian soil attributed to international groups like the Islamic State or Al Qaeda have been rare, and the country’s domestic security services have less experience tracking those threats and are less skilled at penetrating Central Asian extremist cells.

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