My take was the mineral deal was invented by Z (more likely staffers) as a clever ploy designed to appeal to T who is a colossal idiot and can only conceive of geopolitics as consisting of zero sum "deals" that one country makes with another. So they invented a deal. I always assumed it would be a shit deal for T, since idiot and all. But it seems he wanted the shit sandwich for free. Basically negotiated himself into no deal.