In her notes, State Department official Kathleen Kavalec also referred to the two Russians former Russian foreign intelligence chief Vyacheslav Trubnikov and Putin aide Vladislav Surkov as sources.
Dan Bongino has the notes by Kavalec and accompanying analysis
https://www.youtube.com/channel/UCJuHKSaD0o7mX6jSbvisnvg
from 978.
I view this as something of a false flag operation. Nunes seemed to say the same thing during his interview on Fox this morning. He said it was hard to believe that Trubnikov, Brennan's equivalent, would be acting as a source. If that were the case, he would be dead by now. The so-called Steele dossier was really a product of multiple sources including Nellie Ohr, Sid Blumenthal, Steele, Glenn Simpson, and others. Steele was selected to give it "gravitas." IMO it was all made up without the use of Russian sources. Brennan and Clapper are probably the sources for this being a Russian disinformation campaign.