Crude oil markets edged upward on Friday despite lingering uncertainty surrounding the durability of a newly minted US-Iran peace arrangement, as the sudden cancellation of follow-up diplomatic talks in Switzerland underscored the fragility of the accord. The move by Vice President JD Vance to abandon his travel itinerary to the neutral country signalled potential cracks in international resolve to cement the agreement, prompting traders to reassess their positions amid volatile regional developments.

Brent crude futures climbed 51 cents to settle at $80.36 per barrel, representing a 0.64% advance, while US West Texas Intermediate crude surged $1.28 to $77.88 per barrel, a 1.7% jump, as the front-month July contract approached its Monday expiration. The more heavily traded August WTI futures posted a gain of 59 cents, closing at $76.44 per barrel. Despite the Friday rally, both benchmark contracts remained on track for a substantial weekly decline of approximately 8%, reflecting the broader market sentiment that swung between cautious optimism about the peace deal and renewed anxiety about its staying power.

The diplomatic stumble comes at a critical juncture, just days after the presidents of Iran and the United States signed an interim accord designed to terminate their protracted conflict and stabilise one of the world's most strategically vital regions. The abrupt postponement of the Switzerland talks, initiated after Vice President Vance reversed his planned participation, injected fresh uncertainty into oil markets and prompted analysts to question whether the agreement possessed sufficient political backing to weather inevitable implementation challenges.

Vandana Hari, founder of Vanda Insights, a specialised oil market analysis firm, observed that oil prices may have reached their floor in the immediate term, with the potential for volatile upward pressure as structural cracks become evident in the underlying memorandum of understanding. She cautioned that the geopolitical backdrop provided little reassurance regarding the normalisation of maritime traffic through the Strait of Hormuz, a chokepoint that channels approximately one-fifth of global oil and liquefied natural gas trade under ordinary circumstances. The absence of confidence in resumed transits through these critical waterways remained a persistent concern constraining deeper price declines.

Thursday's trading session had witnessed both oil benchmarks touching their lowest levels since early March, a period that coincided with several tankers, including three Saudi-flagged vessels carrying a combined six million barrels of crude, successfully navigating the Strait of Hormuz within hours of the presidential accord. This apparent thaw in maritime activity initially encouraged traders, though the subsequent cancellation of US-Iran negotiations dampened enthusiasm for an extended rally.

Market observers have projected that the comprehensive peace agreement could eventually unlock more than 85 million barrels of crude currently trapped in Middle Eastern storage facilities, supplemented by the anticipated removal of American sanctions on Iranian petroleum exports. Such an influx of additional supply to global markets would substantially pressure prices downward, assuming the accord remains intact and implementation proceeds as envisioned. However, traders have grown circumspect, with many awaiting tangible confirmation that Hormuz tanker movements are genuinely returning to pre-conflict normalcy before committing fresh capital to further price depreciation.

Tim Waterer, chief market analyst at KCM, highlighted this cautious stance among market participants, noting that evidence of sustained, normalised shipping patterns through the strait remains the critical litmus test for traders considering the next phase of potential price decline. The psychological barrier of confirmed transit activity supersedes diplomatic statements, given historical instances where agreements unravelled despite initial optimism.

Simultaneously, regional producers have begun repositioning for a return to more substantial export operations. Kuwait Petroleum Corp announced Thursday that it had immediately rescinded all force majeure declarations that had remained in effect throughout the conflict, signalling operational readiness to resume normal export schedules. Iraq's petroleum ministry similarly indicated that its oilfields stand prepared to gradually restore production capacities back toward their pre-conflict baseline, with Oil Minister Basim Mohammed confirming the trajectory toward normalised output levels.

Yet the unresolved Israeli-Hezbollah confrontation in Lebanon presents a complicating factor that could unravel the fragile US-Iran settlement. Israel's continuation and intensification of military operations against the Lebanese militant organisation raises legitimate questions about whether the underlying geopolitical tensions have genuinely subsided or merely been temporarily suppressed by the interim agreement. Should hostilities escalate further or expand beyond Lebanon, the entire diplomatic framework could fracture, triggering immediate and potentially severe repercussions for oil markets dependent on sustained regional stability.

For Malaysian and Southeast Asian energy importers, the trajectory of this accord carries profound implications. Malaysia, as a net energy importer with significant petroleum consumption, stands to benefit from moderating crude prices should the US-Iran agreement hold and additional Iranian supply reaches global markets. However, the region's exposure to Middle Eastern geopolitical volatility—through shipping lanes, energy security, and broader trade relationships—means that any collapse of the accord or escalation of regional conflict would impose measurable costs on the wider economy through elevated energy expenses and supply disruptions.

The coming weeks will prove decisive in determining whether the US-Iran peace arrangement represents a durable shift in Middle Eastern geopolitics or merely a temporary respite before renewed tensions resurface. Oil market participants are essentially wagering on diplomatic durability, with prices serving as the transparent reflection of their collective assessment of probability.