News to me.
The CIA & FBI believe that the leaks were supplied by russian intelligence — which is in line with what most security researchers already believed. It’s not unexpected that the FSB would time a leak to maximize its effect.
If the CIA & FBI have stated that Wikileaks is complicit in choosing the timing of releases to benefit the FSB’s plan, rather than agreeing that the FSB’s leak timing was appropriate for their own purposes, I haven’t heard that.
This is, of course, your claim: that Wikileaks is in bed with the Kremlin, instead of being a separate organization with its own goals, some of which may accidentally coincide with other actors.
I don’t really see any evidence of explicit collusion.