Victor Fet reports:

 

On April 19th, Radio Svoboda (Prague) ran an hour-long interview (in Russian)
with Vladimir Petkevich, grandson of Olga Nabokov and grandnephew of VN, who lives in Prague.
The interview (with Ivan Tolstoy) can be read and heard at: 

 

http://origin.svobodanews.ru/content/transcript/1612747.html

 

Here is also a small but important archival (1957) text (in Russian) from Radio Svoboda (then called Radio Osvobozhdenie)
on VN's new novel, Pnin:

 

http://www.svobodanews.ru/content/article/1566016.html