This is a keyword based search engine. It shows you pages with the keywords you typed.

Though I strongly disagree with Putin's illegal war of aggression, I don't censor Russian websites. You'll find Russian truth on there as well: https://search.marginalia.nu/site/english.pravda.ru

Did you try searching in Russian? Is it reasonable to expect English-language sources?

Good point. It'd be reasonable to find English sources though, what with 'fake news' and the motivations around that.

Of course it is. There are many Russian sources in English on official government sites, twitter, whatever. And they represent a point of view of at least tens of millions of people, but probably more, invisible to the western audience.