June 1 (UPI) -- Cuba's economy entered June facing another major setback after the departure of Iberostar and Blue Diamond, two of the largest foreign hotel operators on the island. After a U.S. Treasury Department ultimatum setting Friday as the deadline for foreign companies to sever ties with the Cuban military-controlled conglomerate GAESA, Canadian hotel operator Blue Diamond Resorts announced its immediate withdrawal from Cuba, while Spanish chain Iberostar removed its brand and ceased