Belarus is pretty much RUssian-speaking, only people in small villages speak Belorussian. Minsk is also VERY clean and safe from crime I found when visiting.
I found that too when visiting also a couple of years or so before the Virus emerged. I haven't been back since mainly because cost would be a lot more now having to go via Istanbul or similar. There was a lot to like about Belarus, the women dressed in a feminine manner and seem more serious on the whole than Ukrainian women though of course people vary. Crime as you say seemed very low, and it seemed a clean orderly sort of place.
I have visited Ukraine, Russia and Belarus in the past. All could have their potential upsides & downsides. Ukraine & Belarus struck me as preferable for wife hunting to me. Belarus women seemed more serious and down to earth so a potentially sound choice though of course problems and issues can come up with any woman. Ukrainian women I was always drawn to by the more fun and adventurous nature of many of them, though that often seemed to come with a greater risk of potentially a less stable relationship again depending on the girl.
In the end (so far) it seems to cone down a lot to whether a girl is into you, if she's not enough into you problems are likely. Even if she is sound problems can crop up but often not enough to sink a relationship fast as if she's not that into you.
If I was in the market for another girl and Belarus was more easy as it was a while back then I might visit again. The sillyness over plane diversion incident messed that easyness up of course then made worse by the war. So for me Ukraine is still a far cheaper and easier option even with the war ongoing.