And for someone like myself who struggle to read subtitles I would not watch a show that was mostly subtitled.The interview linked above mentions that - it seems it is a possibility to do subtitles but a very small one. They have not decided yet which way to go apparently and even though i'd love to see them speak Russian with subtitles ( it was a brilliant element in Shogun and brought a special atmosphere to hear them speak their native language) it's not feasible for a multi-season show, it'll either be some russian accent english or pure english to make it easier for the audience.