Sergei Beseda chief of the FSB "fifth service" was arrested after the start of the war. https://meduza.io/en/feature/2022/06/20/no-infighting-here is a story I found around it. I guess we can't be definite, but that journalist in Russia was citing sources saying that the service had essentially embezzled money and made up the data about their resources on the ground in Ukraine, and misrepresented polling data they had that Russia would be welcomed by the general population.