Oil drops 5% on Iran ceasefire, yet Treasury relief looks temporary

A reported US-Iran ceasefire including free navigation through the Strait of Hormuz sent crude tumbling more than 5 percent, but the resulting Treasury yield relief may be short-lived.

WTI crude plunged more than 5 percent Tuesday on reported US-Iran ceasefire terms including Hormuz free navigation, pushing the 10-year Treasury yield down 6 basis points to 4.64 percent.

"It is better that we bring the war to an end now, as we are in a position of power and dignity," Masoud Pezeshkian, president of Iran, said Friday, as Tehran confronts the collapse of oil exports and a currency that has plunged past 2 million rials per dollar.

The reported deal, cited by Russia's RIA Novosti from Pakistani military and Iranian security sources, includes provisions for commercial shipping to move freely through the strait — a waterway that carried about 20 million barrels of oil and LNG daily before the war began Feb. 28. US Energy Secretary Chris Wright said the seven-day average for oil leaving the strait has recovered to nearly 9 million barrels per day, up from minimal movement earlier in the conflict. Iran's central bank governor Abdolnaser Hemmati publicly confirmed: "It is a reality that we are not exporting oil."

The oil-driven yield decline offers Treasury Secretary Scott Bessent only temporary relief. Inflation remains above the Federal Reserve's 2 percent target, sovereign bond supply is heavy — including a $70 billion five-year auction Wednesday — and the policy mix still supports strong nominal growth. These structural factors keep a floor under long-end yields, with the Jackson Hole symposium now the next window for directional guidance.

The ceasefire report follows weeks of intensified diplomacy involving Pakistan, whose army chief Field Marshal Asim Munir traveled to Tehran this week and met with Pezeshkian, Parliament Speaker Mohammad Bagher Ghalibaf and other senior officials. Iran has demanded Washington return to the Islamabad Memorandum of Understanding signed June 18, which paused the war and included provisions on safe commercial navigation through the strait. The agreement has not been officially confirmed by Washington or Tehran.

The reported breakthrough comes as the US Navy executes two simultaneous operations: a total blockade of Iran's ports designed to sever the regime's financial lifeline, and a convoy system guiding tankers through the southern channel of the strait hugging Oman's coast. The strategy has reversed the dynamic that prevailed earlier in the conflict, when Iran exported about 1.8 million barrels per day between the Feb. 28 launch of Operation Epic Fury and the first ceasefire on April 8, even as American and Israeli air forces bombarded the country.

Structural Pressures Cap Yield Relief

The 10-year yield's 6-basis-point drop Tuesday extends a five-week range-bound pattern, with the benchmark stuck between roughly 4.5 percent and 4.8 percent. Cheap oil eases inflation expectations at the margin, but it does not address the drivers pushing long-end yields higher: persistent inflation above target, heavy sovereign issuance, and a policy mix that keeps nominal growth elevated. The $70 billion five-year auction Wednesday adds to a crowded supply calendar ahead of September's issuance peak. Term premium remains the central challenge for Bessent's push to engineer a structural decline in yields.

What Happens Next

If the ceasefire is formally announced in the coming days, oil prices could extend their decline, providing further near-term relief to inflation expectations. But the sustainability of any yield move depends on whether the Fed signals a shift at Jackson Hole later this week. The last time the US and Iran reached a ceasefire — on April 8 — oil prices initially fell before rebounding as the truce collapsed within weeks.

Iran's hardliners, including Islamic Revolutionary Guard Corps commander Ahmad Vahidi, may resist a settlement until they attempt one more escalation. Iran has threatened to fine or confiscate ships passing through the strait, a move aimed at undermining Washington's effort to restore free navigation and intimidating tanker owners. The strait handled roughly one-fifth of global oil consumption before the conflict, and any breakdown in the ceasefire framework would reimpose supply disruption risks that pushed Brent to multi-year highs earlier this year.

Qatar, which has been mediating between Washington and Tehran, said it continues to support diplomatic efforts to resolve the conflict. Foreign Ministry spokesperson Majed al Ansari stressed that restoring normal navigation through the strait remains a priority, while warning that further escalation would have wider repercussions for the region and the world.

This article is for informational purposes only and does not constitute investment advice.