Searching for'male belarus x russia fanfiction' is an interesting quest. You could start by joining relevant fanfiction groups on social media platforms. Maybe post a request there. Another option is to look through the works of authors who are known for writing about Slavic countries and their relationships. But keep in mind that the availability of such specific fanfiction might be limited.
I'm not sure of specific fanfiction stories for'male belarus x russia'. You could try searching on popular fanfiction websites like Archive of Our Own. They might have some works in this category.
Well, finding'male belarus x russia fanfiction' can be a bit tricky. Fanfiction communities are quite diverse, but you may have to dig deep. Sometimes, looking for general Slavic or regional relationship - themed fanfictions might lead you to something relevant. However, I don't have a ready - made list for this specific pairing.