You can find and download collected works of Fyodor Dostoevsky in FB2 and other formats through several reputable digital libraries. Below are some reliable options for both Russian and English editions.
If you're interested in the history of his publications or his personal life: (Dostoevsky:) letters and reminiscences dostoevskii skachat sbornik fb2
: A massive repository of free ebooks where you can find almost all of Dostoevsky's major works in EPUB and Kindle formats, which can be easily converted to FB2 if needed. You can find and download collected works of
If you are looking for the original Russian texts in FB2 format: If you are looking for the original Russian
: Offers beautifully formatted, public-domain editions of major novels like Crime and Punishment , The Idiot , and The Brothers Karamazov . You can download individual books or join their Patrons Circle to download the entire collection as a single zip file.