Israelis were celebrating on Friday what many see as a stunning new success by their country’s foreign intelligence service, the Mossad. Hours after launching 200 warplanes in a wave of strikes against Iran, Israeli officials released footage they said showed the Mossad agents deep inside Iran assembling missiles and explosive drones aimed at targets near Tehran. According to unnamed security officials who briefed Israeli media, similar precision weapons were launched from trucks smuggled into the country and a “drone base” hidden somewhere near Tehran. This was established well in advance of Friday’s attack and used to destroy Iran’s air defences,...