U.S. stock index futures came under pressure on Tuesday, with S&P 500 futures down 0.3% in early trading. Other Wall Street index futures were also in negative territory, as Nasdaq 100 futures fell more than 0.4% and Dow Jones Industrial Average futures dropped over 120 points.

Global equity markets continue to experience volatility due to the conflict between the U.S. and Iran, which has driven oil prices to multi-year highs. On Tuesday, oil prices surged approximately 4%, with Brent crude holding steady above the key $100 per barrel threshold.