baghdad iraq stop sell dollars lead bank kurdistan ban foreign currency transfer autonomous region tuesday step retaliation kurds independence vote financial sanction follow ban direct international air travel region impose central government friday iraq central bank inform kurdistan regional government krg would stop sell dollars four major kurdish bank stop foreign currency transfer region bank government source tell reuters businesses need foreign currency foreign workers kurdistan whose pay remittances usually dollars affect new measure business people expatriate also directly hit ban international flight kurdish airports erbil sulaimaniya force travel via airports baghdad southern iraq increase cost add delay condition end dollar sale prohibition kurdish bank central bank control say iraqi official kurdish official krg capital erbil say region bank already report central bank baghdad airports kurdish region already report iraqi civil aviation authority iraq parliament tuesday say vote financial sanction would preserve interest kurdish citizens target kurdish leadership shi ite arab-led iraqi government reject offer kurdish government discuss independence demand cancel result sept. 25 referendum face continue sanction international isolation possible military intervention u.s. administration strengthen alliance iraq kurds war islamic state take side baghdad crisis refuse recognize referendum iraq powerful neighbor iran turkey back baghdad fear spread separatism kurdish populations iraq step retaliation kurdish independence vote dollar ban