Kisylak was recorded talking to Moscow. So an intelligence agency got the recording, let's guess NSA if intercepted en route to Moscow, and FBI counterintel if, as reported, Kisylak's phone was hacked and acted as a microphone. This is likely the same intelligence source that disclosed Kushner trying to set up his own secret channel. That was also reported as coming from Kislyak intercepts.

P.s. whoever leaked these knows they are burning a highly valuable method - recording the Russian ambassador talking to his government??? That is a highly highly valuable capability now ruined because Russia knows we can do it. I'm guessing whoever at NSA or FBI or wherever leaked it did so with some endorsement from above and judging the help to the country now was worth burning the method.

... leak this info if the Russians weren't in on it.

My take is the Russians ARE in on it and talked about it on purpose to get Sessions out of office since Sessions has already said he didn't know shit in sworn testimony to congress.

Red Don doesn't look both ways before crossing the street so this is about the best way they can get Sessions out of the way to fire Mueller.

Mueller should go mach 2 into finances right hot damn now, winger radio is pushing Mueller as a HRC shill hard to give cover for Red Don's dismissle of him.