Belarus doesn’t have a problem of unwanted immigrants coming  except for Chechens and others who travel to Brest from Russia wanting to enter Poland and then Germany asking for a refugee status.

Russians are the biggest foreign property buyers in Belarus imo. Those are usually wealthy people. Russia has plenty of affordable land with a similar environment and climate.

I can see where you are coming from. I’d want to ban the sale of residential land if there was a similar problem in my country.