https://duckduckgo.com/?t=ffab&q=VK&kl=ru-ru&ia=web
Might be a partnership with Yandex to not show russian results outside Russia? Because they use Yandex in Russia.
https://www.reddit.com/r/duckduckgo/comments/a7nl1v/duckduck...
This probably explains it: DuckDuckGo indexes different languages together in one big index internally(?). "VK" returns many results in Russian, filling some maximum number of results. And then a filter just removes all the Russian ones if you're searching from a non-Russian locale?
Quite the opposite.
My search results from DDG over the past year or so have been infested with Russian sites, articles and even twitter account titles of English language accounts, despite not living there and not having any preference for Russian in any browsers settings or regions and never issuing a single query in Russian.
Perhaps it was intended as a slight against Russians, but I'd ask you to assume good faith.
It might be a Yandex partnership to not show outside Russia