Noting it's been over a year since you posted this, have you found answers?i'm very curious about the relation of the music of Debussy and Scriabin. I've read that the only known comment made by Scriabin on Debussy is something like "He shouldn't have stolen from our Russian music". There were russian musicians that predates the music of the french composer?
And Debussy knew about Scriabin?
Not having read a Scriabin biography, and relying only on a few online sources, I came up empty on any Debussy/Scriabin relationship and quotes.
Wikipedia lists Tchaikovsky, Balakirev, Rimsky-Korsakov, Borodin, and Mussorgsky as Russian influences on Debussy's music. The first four being minor, and Mussorgsky more so for Boris Godunov influence on Pelleas et Melisande.
Scriabin visited and resided in Paris between 1898 and 1907, so I would think they knew of each other.