In 2008, he had a book published detailing his story:
In 2008, NPR ran a story on Tretyakov with the release of his book. (LISTEN)
Tretyakov may be added to my list of the "great defectors", although I must research further to ascertain whether or not he is bona fide or a source of strategic disinformation.
The following interview of Tretyakov on CNN suggests he may be the real deal:
There is a commentator on YouTube indicating that Tretyakov could be a false defector based upon his suggestion that Russia and China have adversarial relations, a point with which I would concur. (Tretyakov might simply not have been in a position to know the truth on this score.)