Iranian President Hassan Rouhani is seeking to boost economic links with Iraq on his first official visit to the neighboring country, at a time when the U.S. is upping efforts to curb Tehran’s regional influence. A strong relationship with Iraq—a former enemy—is now paramount in Iran’s foreign policy. Tehran is looking for Baghdad’s support to mitigate the effects of sanctions reimposed by the U.S. after it pulled out of the 2015 multilateral Iranian nuclear deal last year. While Iraq is a major oil producer, it still relies…