Is this for a character in a book or a real person?
Unless you live in a part of the world where
Vladimir,
Dmitri, and
Radoslav are familiar names, or unless they are family names or names that reflect your cultural heritage, it would be a really bad idea to saddle a child with these names.
Vladimir makes me think of
Vlad. As in
Vlad the Impalor. As in Dracula.
Radoslav makes me think of radio and slaw.
Dmitri is the leas "wierd" of the three, but, again, just doesn't really make sense for someone outside of Eastern Europe.
Why so focused on Russian/Slavic names?