If Lithuanian sounds Greek mixed with Hungarian, then Belarusian should sound Greek mixed with Hungarian too. It’s been shown on many occasions that Lithuanian and Latvian are most similar to Slavic. Specifically to eastern Slavic languages. Belarusians and Lithuanians including their languages and dialects attracted so much attention among scholars since 1970s. These studies are published in the Russian Academy of Sciences (Balto-Slavic section) . In Lithuania too. Type in search engine Google “Why Lithuanian sounds Russian” and see the number of discussions on the subject.
I don’t mean any offense . Is Slovak your native (first) language? You strike me as an American. Not that there’s anything wrong with being an American.