US-Iran Conflict Escalates as Ceasefire Expires and Markets Plunge

Geopolitical tensions between the United States and Iran escalated sharply following the expiration of a 60-day truce on August 17, 2026. Donald Trump ruled out extending the ceasefire and maintained a naval blockade, stating that no negotiations are currently scheduled with the Islamic Republic of Iran. In response, the Government of Iran announced a shift to a "fully offensive" military posture, with Parliamentary Speaker Mohammad Ali Ghalibaf declaring the Strait of Hormuz would remain closed until the blockade and oil embargo are lifted.

The conflict expanded as the United Arab Emirates detected two Iranian ballistic missiles and subsequently halted all financial and commercial transactions with Tehran. Simultaneously, the U.S. Department of Defense began evaluating a potential troop pullback from the Middle East, including the possibility of not rebuilding bases struck during the fighting.

Global markets reacted violently to the instability. U.S. 30-year Treasury yields hit their highest level since 2007, while the Nasdaq Composite plunged over 1.3% as rising borrowing costs hit semiconductor stocks like Nvidia and Intel. Brent crude prices climbed above $90 per barrel due to the closure of the Strait of Hormuz. This volatility coincided with a weakening U.S. dollar, as investors lowered expectations for a September Federal Reserve interest rate hike following soft July economic data.