Crude Futures Tumble 5% as Trump Vows to Sign Iran Deal, Reopen Strait of Hormuz

For traders and portfolio managers, the whiplash between Trump’s bombast and Iranian caution offers a textbook lesson in headline risk. A 5% plunge in front-month WTI within minutes of the Truth Social post highlights how swiftly peace can punish energy longs. While bulls bet on a quick signing, options markets are pricing in a one-in-three chance the deal collapses within 72 hours.

On Saturday, June 13, 2026, President Donald Trump ignited a wave of cautious optimism across global markets with a Truth Social post declaring that a landmark peace agreement with Iran would be signed the following day, accompanied by the immediate reopening of the Strait of Hormuz—the world’s most critical oil transit chokepoint. The announcement came amid conflicting signals from Tehran, where state media quoted a foreign ministry spokesperson warning against premature certainty, underscoring the fragility of the diplomatic breakthrough. The strait, through which roughly a fifth of global oil supply passes, had been effectively closed for months amid escalating military tensions, causing a spike in energy prices and logistical chaos for global supply chains.

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The disruption rerouted massive tanker traffic around the Cape of Good Hope, inflating shipping costs by up to 400% and pushing Brent crude above $130 per barrel at its peak.

The geopolitical context is rooted in a protracted conflict that saw Iran’s nuclear ambitions and proxy warfare clash with U.S. red lines, resulting in a near-total maritime blockade. The disruption rerouted massive tanker traffic around the Cape of Good Hope, inflating shipping costs by up to 400% and pushing Brent crude above $130 per barrel at its peak. Now, Trump’s assertion—bolstered by Pakistani Prime Minister Shehbaz Sharif’s statement that a deal was imminent—suggests a potential normalization. However, the Iranian foreign ministry’s immediate pushback (“it will not be tomorrow”) injects significant uncertainty. Trump’s post also included a veiled threat of “the ultimate alternative,” hinting that military options remain on the table if compliance falters.

For the energy market, the immediate impact is a sharp repricing of risk premiums. Crude oil futures began to tumble in after-hours trading, with WTI and Brent shedding as much as 5% as traders priced in the resumption of unfettered transit. The psychological shift could be profound: tanker companies, which had enjoyed windfall profits from elevated day rates, face a normalization; insurers, who hiked war-risk premiums to prohibitive levels, will likely unwind those charges; and refiners worldwide, particularly in Asia, can expect cheaper feedstock. The deal’s timing—just before the summer driving season—could temper gasoline prices, potentially easing inflationary pressures that have dogged central banks.

Yet the market’s relief rally may be premature. Iran’s caution reflects deep-seated mistrust and the complexity of the memorandum of understanding, which reportedly includes not only maritime access but also the removal of enriched uranium buried under “sunken granite mountains.” That process, described by Trump as occurring “at the appropriate time,” adds a layer of technical and diplomatic hazard. Any hiccup could re-escalate tensions. Moreover, the Strait of Hormuz’s openness depends on Iran’s genuine compliance, and the absence of a clear enforcement mechanism raises the specter of backsliding.