U.S. stock index futures rose on Tuesday due to a report suggesting a potential de-escalation in the Middle East conflict, which has led to the S&P 500 and Dow set for their largest monthly decline in years. The news has calmed market nerves after a month-long conflict that has left the country's stock markets reeling. Economists are not expecting the war to cause significant damage to growth, with analysts maintaining their pre-war targets and making little changes to earnings forecasts. The oil spike from the Iran conflict has revived inflation worries, leading money market participants to price out any Fed easing from the previous year.