Oil prices inched higher on Wednesday as shipping attacks and the stalled Iran nuclear negotiations reinforced supply anxieties in the Middle East, yet the rally proved constrained after major forecasters reduced their global demand estimates for next year. Brent crude futures advanced 7 cents to settle at US$88.98 per barrel, mirroring a similar gain in US West Texas Intermediate, which climbed 7 cents to US$83.27, reflecting a market caught between conflicting signals of disruption and weakening consumption.

The diplomatic impasse between Washington and Tehran continues to weigh heavily on market sentiment. According to a senior Iranian source, there are currently no discussions underway to extend any ceasefire arrangement, a position rooted in Tehran's assertion that no formal start date exists for the previous accord and therefore nothing can be extended. This fundamental disagreement underscores the deep chasm between the two sides, with neither showing signs of movement toward compromise. The absence of meaningful dialogue has effectively removed any near-term prospect for a negotiated resolution, leaving regional tensions to drive price movements through the supply disruption channel alone.

Attacks on commercial vessels operating through critical Middle Eastern shipping lanes added urgency to market anxiety. Both the United States and Yemen's Houthi forces reported separate maritime incidents affecting transit routes through the Strait of Hormuz and the Bab el-Mandeb Strait on Tuesday, both essential conduits for crude exports from the Persian Gulf region. These waterways, alongside the Suez Canal, form the backbone of global oil distribution logistics, and any interference threatens the smooth flow of supplies to world markets. The escalation demonstrates how the broader regional conflict has created a direct tax on international trade and energy security.

Shipping data provided a stark illustration of the toll these tensions are taking on commerce. Transit volumes through the Strait of Hormuz collapsed to just eight vessels on Tuesday, marking a one-week low and a dramatic departure from pre-conflict norms, when 125 to 140 ships regularly transited the chokepoint daily. This represents a decline of over 90 percent in traffic, signalling that companies either are finding alternative routes or are suspending shipments altogether due to security fears. For Malaysia and other regional economies dependent on energy imports and global trade flows, such disruptions carry immediate implications for supply chains and operational costs.

Despite the supply-side pressures, demand forecasts are working against the bulls. The Organisation of the Petroleum Exporting Countries revised its 2026 global oil demand growth projection downward to 580,000 barrels per day in its latest monthly report, suggesting weaker consumption ahead than previously anticipated. The International Energy Agency went further, cutting its 2026 demand projections and now forecasting a 1.6 million bpd contraction this year alone. These downward revisions reflect a sobering reality: disrupted supplies are forcing refiners, particularly throughout Asia, to reduce operating rates as they struggle to source adequate crude feedstock, and this temporary demand suppression may harbour longer-term structural changes in consumption patterns.

Yet the IEA's own supply analysis offers a countervailing perspective. The Paris-based agency is simultaneously predicting a 4.3 million bpd drop in supply this year and an overall 2026 deficit of approximately 1.27 million bpd, suggesting that supply shortfalls could outpace demand declines. This projection indicates potential tightness in markets ahead, though it assumes no major escalation or geopolitical surprises. For energy-importing nations in Southeast Asia, such supply deficits could translate into persistent price pressure and heightened competition for available barrels.

Simon Wong, portfolio manager at Gabelli, articulated a crucial analytical distinction that market watchers are grappling with: the difference between temporary demand management and permanent demand destruction. Refiners in Asia have deliberately throttled back production runs to match the crude they can actually procure given shipping constraints and route diversions. This represents a cyclical adjustment that should reverse once stability returns. However, Wong noted considerable uncertainty over how much pre-conflict demand will genuinely recover, suggesting that some customers may have shifted to alternative energy sources or reduced consumption habits that prove sticky. The permanence of any demand loss carries profound implications for long-term price trajectories and investment decisions across the energy sector.

Malaysian and Southeast Asian policymakers should note that the region faces dual pressures: the direct cost of any sustained higher oil prices affecting domestic fuel and electricity costs, and the indirect impact of reduced shipping flows through regional waters that support broader trade connectivity. Energy-intensive industries relying on stable supply and pricing now operate under heightened uncertainty, and energy policy decisions made during this period could reshape regional energy dependencies for years to come.

American crude inventories delivered an unexpected surprise that added a deflationary note to proceedings. The US Energy Information Administration reported that crude stockpiles posted their largest weekly build since January 2023, driven primarily by a precipitous collapse in exports and a surge in imports. This counterintuitive inventory accumulation amid supply disruptions suggests that refiners are unable to absorb available crude into production quickly enough, pointing to demand weakness even as prices attempt to rise. The inventory dynamic reveals how supply disruptions and demand softness are interacting to create an awkward market equilibrium, with neither force clearly dominant.

Looking forward, the trajectory of Middle East tensions and US-Iran negotiations will remain paramount. Should diplomatic efforts gain traction, oil prices could face substantial downward pressure as both supply relief and demand recovery expectations shift. Conversely, any significant escalation of attacks or widening conflict could trigger sharp price spikes that would reverberate through regional economies. For Malaysian traders, energy importers, and policymakers, navigating this volatility requires close monitoring of both the political developments in the Middle East and the incremental data releases showing demand and supply dynamics.