So, with Islamic State - Khorasan claiming responsibility for yesterday’s attack near Moscow, it seems to me that Russia’s security services dropped the ball in horrific fashion.

They’re so hyper-fixated on Ukraine, and I’d imagine on the hunt for “Ukrainian saboteurs”, that they missed a threat coming at them from an unanticipated direction - and despite the fact that their American intel counterparts warned them that their (relatively specific) SIGINT revealed that some kind of atrocity was being planned for concerts in and around the Moscow area. Recall that we warned them of this a couple of weeks back, and indeed, issued a public notice for Americans travelling in Russia to be wary of this - something Putin himself contemptuously dismissed.