It is not necessary. WWW is a subdomain which "sometimes" pointed to the computer on which stood a web server (sometimes within a domain, many computers). And browsers were trained to search in this subdomain. If you type in not chrome-like browser "doman" + enter, the browser will try to sort through until you find the site: "domain.com", 'www.domain.com', 'domain.org' etc... Sometimes if You specify an existing "domain.com" and there's no web server, the browser can automatically start to feel on www.domain.com.
Now the browsers go to search engines and the WWW is not true. In any case, if you and I do, then You need to do "www.домен.рф
"and not to "BBB." and not "VP.".