okay...let me be completely honest...

i have found kapustin's soviet recordings, courtesy of his son. i have
withheld this information on account of my own self-serving motives,
but i have decided to come clean about it and share my discovery with
you all. there is no logic in listening under covert provisions of my
own home. i feel it is an act of indiscretion channeled in opposition
to those who were not privileged to listen, and am therefore, turning
over the link.

the track listing includes:

etude op.19
nocturne op. 20
piano concerto op. 14
concert rhapsody op.25
...etc

http://theory.caltech.edu/~kapustin/Nikolai/Nikolai_Kapustin_index.htm