Exclusive: Global traders halt new Iran food deals as U.S. sanctions bite - sources

LONDON/DUBAI (Reuters) - Cargill, Bunge and other global traders have halted food supply deals with Iran because new U.S. sanctions have paralysed banking systems required to secure payments, industry and Iranian government sources say.Food, medicine and other humanitarian supplies are exempt from sanctions Washington reimposed this year after U.S. President Donald Trump said in May he was walking away from a 2015 international deal over Iran's nuclear programme.But the U.S. measures targeting..