There's a rumour going around in March that the FSB had an assignment (for years now) to bribe the Ukranian military , which of course the FSB officers reported

There's a rumour going around in March that the FSB had an assignment (for years now) to bribe the Ukranian military , which of course the FSB officers reported they did while pocketing the money ("they're giving me cash in preparation a war that'll never happen, and they don't expect a receipt? Don't mind if I do!"). So it's possible Putin/other departments thought the Ukranian military had been pacified. The second part of the rumour is that the FSB officers panicked when they realized war was really going to happen, so they leaked the plans to the CIA in hopes of getting Putin to back down.