Can I ask you, why are you think that Russians scientific sources contains a bit more information than English?
In Russia all scientists know that information from English articles is more actual in most cases (naturally, there are some exceptions).
But if you want to search a mathematical, physical and other lessons in Russian then you can try to enter words such as 'наука' (science), 'математика' (mathematics) and 'уроки', 'лекции' (lessons, lectures) in YouTube or Google (you can try to use a translator to get more tag-words).