Why do you learn Russian?

I have a Russian fiancee and want to be able to speak to her family.

I'm interested in linguistics and Russian seemed like a cool language

I traveled a lot and whenever I went I almost always met a Russian person there. Lots of ex-USSR folk who speak Russian even in western Europe and other countries like UAE, Czech Republic etc. Majority of Ukrainians, Moldovans, Uzbeks, Azeri, Armenians etc speak Russian too, so there's a pretty significant amount of Russian speakers out there.

I heard Russian in media, especially movies and it seemed interesting. I don't learn that hard, just Duolingo and some additional materials from time to time. Learning a new language is a good brain exercise.

To be able to listen and understand Splin, Kino, Piknik and Nautilus Pompilius (and others)