Inside his twisted and cruel mind, Putin is actually happy this happened. Don't need a PHD to figure that out.
He can use it to brainwash more of his people.
Whats INTERESTING about the hypothesis of it being a Russian FSB plot is the parallel to American imperialist history.
The Utah Mormon militiamen, in order to whip up traumatic frenzied zeal among settlers, dressed as Indigenous & tried to persuade Southern Paiute tribespeople to attack California bound settlers.
Im not saying it is a plot, but the hypothesis cannot be dismissed out of hand that the FSB let it happen.
«The Kremlin said all four suspects directly involved in the attack have been arrested while trying to cross the border to Ukraine, along with several others.»