President Donald Trump said the military action was a response to Iran's attempt to lay mines in the Strait of Hormuz and to Iran's earlier strikes on a US military base in Jordan, and he warned of further strikes if Iran retaliates. ^[1] US Central Command said that US forces struck targets belonging to Iran's Revolutionary Guard. ^[2] Brent crude for December delivery rose 4.1% to $95.4 per barrel and WTI crude for October rose 0.4% to $90.6 per barrel on 2026-09-01, as US strikes on Iran heightened Middle East tensions. ^[3] Major global stock indices fell on 2026-09-01, with the Dow Jones down 0.79%, S&P 500 down 0.71%, Nasdaq down 1.03%, FTSE 100 down 0.32%, CAC 40 down 0.39%, DAX 40 down 1.10%, FTSE MIB 30 down 1.33%, Kospi down 3.4%, Nikkei 225 down 3%, Hang Seng down 1%, Shanghai Composite down 1%, and BIST 100 down 0.73% to 14,229.01. ^[4] The US 10-year Treasury yield rose to 4.82% on 2026-09-01, the highest since November 2023, while the 2-year yield reached 4.42%, the highest since January 2025. ^[5] US President Donald Trump announced on 2026-09-01 that the US conducted new strikes against Iran, warning that Iran would face a larger attack if it retaliated. ^[6] Korea's KOSPI index fell 158.31 points, or 2.32%, to close at 6677.49 on Tuesday morning. ^[7] The KOSPI index opened down 210.33 points, or 3.08%, at 6625.47 due to rising oil prices and US-Iran military tensions. ^[8] International oil prices reached their highest level in five weeks as renewed tensions in the Middle East increased fears of new supply interruptions from a major global producing region. ^[9] US major stock indices closed higher for the first time in four trading days, ending a recent downturn. ^[10] Kalshi is preparing to file with the Commodity Futures Trading Commission for approval of a perpetual futures contract tied to West Texas Intermediate crude oil, according to a source cited by Reuters. ^[11] The S&P 500 fell 0.7%, the Nasdaq fell 1.0%, and the Dow Jones fell 0.8% on Wall Street. ^[12]