For a small fish like your friend presumably is, this is practically undoable in the direct way BY-EU nowadays, I'm afraid; especially if it is a new business relationship and not the maintaining of a long-term established one. Political pressure at all participants is too high, I would say. He can give it a try with his current accout︀ in BY but chances for success are IMO very low. (The problem is not only︁ the payment but the business relation with BY subject itself.)
With a middleman in some︂ of usually used destinations (UAE, Kazakhstan, Serbia, Georgia, LatAm) it is well doable. Or with︃ crypto, of course.
(And if there is some big business /in millions/ behind, it is︄ of course doable even directly.)
Very probably yes but it︆ will not help him much to solve the above described situation. It will still be︇ an account belonging to BY citizen.