You don’t state whether the condition is that the book must get distributed inside Russia, but I think your comment about the shipping costs outside of Russia means that you are interested in international reach as well.
I think some of the things you might do:
1) do all the steps you already did for in-country distribution (maths Olympiad winners etc) in the countries of ex-Soviet Union with a large Russian speaking population (Ukraine, Belarus, the Baltics, Georgia, Kazakhstan, other stans).
2) Approach Russian student societies (or Rationality/EA adjacent) of (whatever selection: Ivy league, Russel group, much broader to take advantage of the large print amount) of universities, particularly with maths/rationality background and offer them the books. Even small and less prominent universities have a substantial number of Russian students/ Russian speaking students—e.g. I know University Comenius Bratislava Maths Physics Faculty has Russian students.
3) Approach Ukrainian refugee organisations in the EU to see if they have organisations that coordinate Ukrainian high-school students in the countries and see whether they would want to take these books. For a lot of these students this would be a lot easier to read in Russian rather than English and even if an Ukrainian copy exists (I don’t know if it does), there are plenty of speakers who use Russian as their first language.
You don’t state whether the condition is that the book must get distributed inside Russia, but I think your comment about the shipping costs outside of Russia means that you are interested in international reach as well.
I think some of the things you might do:
1) do all the steps you already did for in-country distribution (maths Olympiad winners etc) in the countries of ex-Soviet Union with a large Russian speaking population (Ukraine, Belarus, the Baltics, Georgia, Kazakhstan, other stans).
2) Approach Russian student societies (or Rationality/EA adjacent) of (whatever selection: Ivy league, Russel group, much broader to take advantage of the large print amount) of universities, particularly with maths/rationality background and offer them the books. Even small and less prominent universities have a substantial number of Russian students/ Russian speaking students—e.g. I know University Comenius Bratislava Maths Physics Faculty has Russian students.
3) Approach Ukrainian refugee organisations in the EU to see if they have organisations that coordinate Ukrainian high-school students in the countries and see whether they would want to take these books. For a lot of these students this would be a lot easier to read in Russian rather than English and even if an Ukrainian copy exists (I don’t know if it does), there are plenty of speakers who use Russian as their first language.