Probably fake. Putin’s regime is looking for any plausible reason to cancel May 9th parade.
Putin and the Kremlin are both legit military targets.
Putlims: Except this.
Maybe this drone attack to kill Putin was a false flag, to cover for the coup plotters.
That is the kind of thing FSB insiders might plan for, looking at the day after the assassination, when they need a fall guy to blame.