No. The facts do not support a third possibility, so no, either Russia dropped a FAB on Blhorod again partially destroying the apartment or the FSB blew up another apartment building.
Ukraine does not engage in wanton terrorism, only Putin has a demonstrated track record of deliberately attacking civilians in Ukraine among other countries. Your silence in condemning such deliberate Russian war crimes yet being so vocal about Russian mistakes trying to pass them off as Ukrainian attacks, or your outrage at obvious faked propaganda, is very telling.
