False flag?

In addition to what the ISW notes, there was a significant gap (over 10 minutes) between the explosions; that no one reacted during that time is especially suspicious considering how quickly and neatly the drones were shot down.

It's also very interesting how they just happened to have a camera conveniently mounted on the building recording the whole thing as it happened.

There are cameras everywhere in Moscow, and all of them are connected to the central CCTV system. The level of surveillance is insane.

Well, I'm not even sure if was, in fact, CCTV.