I forget the exact figures with Iran, but they have around 230 airliners and 220 need replacing. Airbus is selling them slightly more, around 110. A lot of money to be made there with the lifting of sanctions.
Iran and Russia are also discussing a potential joint venture to manufacture Sukhoi Superjets in Iran. For export, I'd assume, as Iran hasn't committed to any Sukhoi buy as yet, and are evaluating other options in the 100 passenger class.