Tell me in your own words...who has the FSB bombed?
There are accusations the FSB [a/k/a KGB in earlier days] conducted the apartment bombings of Sept 1999 ... these bombings boosted Putin’s influence.
Among those making the accusation was the guy who was later poisoned with polonium, if I recall correctly.
The FSB bombed a series of residential apartment buildings in Russia and blamed it on the Chechens. They got caught red-handed when one of the bombs didn’t go off and was tied to FSB agents, then tried to blame it on a “training exercise” (with live explosives of the exact type used in the other bombings!). They also screwed up when one of their underlings in parliament made a statement about a bombing that hadn’t happened yet... that apartment building blew up 2 days later.