I’ve been learning Russian for a few years, I’ve also started learning Serbian and Ukrainian a little bit.
I can speak Russian pretty decently, it’s my girlfriend’s first language so I’ve had a lot of regular practice with it, I don’t consider myself fluent at this point but I can hold conversations with native speakers without too much of an issue
With Ukrainian I can understand quite a bit but I haven’t had much practice speaking it with other people at all yet. I have the basic phrases memorized, things like привіт, будь ласка, доброго ранку, добрий вечір, дякую, як справи, etc. but I don’t think I could hold a conversation speaking only in Ukrainian. I’ve been studying it kind of off and on for a year or so, and I listen to some Ukrainian music fairly often
Serbian I’ve been struggling to learn, I’ve been working on it for about 5 months. I think learning Russian first made it weirdly harder since the sentences are structured fairly differently. When it’s written, I can understand quite a bit, but if someone walked up to me and just started speaking Serbian I’d be completely lost