Global equity markets retreated Tuesday as investors reassessed geopolitical tensions in the Middle East and their impact on energy prices, reversing much of Monday's gains that had lifted major indices. The selloff came amid sustained elevated oil prices as Iran's involvement in regional conflicts continued to fuel supply concerns.

U.S. stock futures pointed to a lower open, with Dow Jones Industrial Average futures down 0.7%, S&P 500 futures declining 0.5%, and Nasdaq-100 futures falling 0.4% in pre-market trading. The retreat followed Monday's broad-based rally that had seen the S&P 500 climb 1.2% and the Nasdaq gain 1.5%.