A further possible link with VN is Edgar Allan Poe. Sibelius had promised Aino Ackté to set Poe's The Raven for her. In fact, he never finished the work, but used some its material in his stupendous fourth symphony.
Nicolas Nabokov was a friend of Stravinsky and wrote disparagingly about Sibelius, whom he apparenty wrongly supposed to be some kind of lush romantic.
Anthony Stadlen