According to Wikipedia: " Langlands likes to learn foreign languages, both for better understanding of foreign publications on his topic and just as a hobby. He speaks French, Turkish, German and Russian".
I'd say it's not _that_ weird, if he likes foreign languages, to combine both his passions and write one paper in Russian :) Also considering there are actually a lot of mathematicians who can read and write Russian.
I'd say it's not _that_ weird, if he likes foreign languages, to combine both his passions and write one paper in Russian :) Also considering there are actually a lot of mathematicians who can read and write Russian.