There's plenty of footage, both Russian and Ukrainian, of teeny tiny copters butchering whole squads of soldiers with a single grenade drop. And this one isn't even that tiny
Maybe false flag, although it would be an egregious one, or this was planned by someone who has no idea what they were doing... not sure which one is more believable.
Maybe this thing? It's not the first time armed drone flied near Moscow.
I don't believe in the false flag, western and UA propaganda used this card with every single terrorist attack and atrocity before.
Also this explosion wasn't really that small if you look at it few times (for example compare scale with seats), if the target was some particular room it would easily kill eveyone inside. Roof was definitely not the target and i read that Russiasn said they jammed that drone so it was most likely out of control at the moment of explosion.