Good point, but remember, the whole Western world essentially is against him. 9 billion doesn't stretch very far then.. What does Bill Gates have, 20 billion? Lukashenko almost half as rich as Bill Gates... From what, illegal trade of tractors or what?? Seems impossible.
I doubt he has even 1 billion. A few million, maybe.
But remember the whole point of his popularity is that he is anti-corruption and a socialist - which is what the traditionalist voters want. If he had stolen even a few millions that would prove that he is a phony and his voters would turn against him, like they did against his predecessors.
Where is this story about the 9 billion? I can't see it on Wikileaks.