The Iranian economy has had an “impressive recovery” following sanctions relief last year, though new uncertainty regarding the fate of the nuclear deal and relations with the U.S. threaten to undermine it, the International Monetary Fund said. Iran’s economy is expected to grow 6.6 percent in the calendar year ending March 20 and stabilize at 4.5 percent “over the medium-term as the recovery broadens,” the IMF said in a report released on Monday.