Mohammad Reza Farzin chosen as new central banker after Islamic Republic hit with further sanctions for protest crackdown, supplying drones to Russia

Value of rial has plummeted by more than 4.4% since the start of June, reaching 332,000 to the US dollar

Day after IAEA censures Tehran for blocking access to two sites and EU diplomats say they'll back extending arms embargo, rial plummets to 190,000 for each dollar