ANKARA (Reuters) - Iran has banned the transportation of refined crude oil products by Iranian companies to and from Iraq s Kurdistan region, the semi-official Tasnim news agency said on Friday, after Tehran vowed to stand by Baghdad following the region s vote for independence.  A directive by the Road and Transportation Organization has temporarily banned carrying oil products from Iran to Iraq s Kurdistan region and vice versa following the latest developments in that region,  Tasnim reported. Iraq s Kurds overwhelmingly backed a call for independence in a referendum on Monday, defying neighboring countries which fear the vote could lead to renewed conflict in the region. A ban on international flights into Iraq s Kurdish region was being imposed on Friday after the Baghdad government retaliated against the vote. Almost all foreign airlines suspended flights to Erbil and Sulaimaniya, obeying a notice from the government in Baghdad, which controls Iraqi air space. Iran, which has its own Kurdish minority, had already halted flights to and from Kurdish regions on Sunday.  