MINSK — It’s noon in Minsk and student Denis Sherbachevich has been waiting for five hours to buy the dollars he needs to pay his rent. “I have no choice but to stand in this line,” the 24-year-old said as he jostled at a foreign-exchange kiosk near Victory Square in Minsk last week. “My landlord demands I pay in dollars or get out, but nobody wants to buy rubles.” […]