I saw it...was it guards?? They keep going after the blast which looked like an attack by a cap gun.
There were also some Kremlin guards on the video watching the drone hit from the street. They just kept talking. Not worried at all.
Anything is possible but the part I found very suspicious is that they exploded the drone when it is just about touching the dome if the thing had any explosives in it capable of doing something to the building letting it get so close could have been devastating.
It seems like the guys climbing there were to make sure when they set the thing off that it didn’t cause any fire.
The Kremlin is worried about the Ukrainian offensive and they want to take some kind of action to blunt it or some kind of severe retaliation or maybe this is just to whip up domestic support for the war.