"Roots of the Present" by N.L. Hayes is a well written story. Waverly meets with Russian officials and interviews Illya for a position in U.N.C.L.E. This story is mostly dialogue and not an actual "Affair." It is only one of many authors takes on how it happened.
http://file40.net/file40g/roots.html
Hope I haven't messed up the link again. If it doesn't work, kindly copy and paste to find the story on the internet. Thanks.