I think, taking into account your field of work, you certainly can move to Belarus in the near future. The most important thing is that you speak English, in my opinion, since most IT-speacialists in Belarus do a lot of work in this language and have to learn to speak it anyway.
I do think, however, that you should at least start learning Russian as soon as possible just to make your everyday life easier. While it may not be urgent for your job, you'll have to somehow communicate with people in, say, a grocery shop. It's always best to know some key phrases in the native language. That's my personal perspective regarding your question
