The proposed levy, according to analysts, carries more weight for its geopolitical signaling than its immediate financial impact. It underscores the heightened risk that any disruption to shipping through the vital Strait of Hormuz could trigger supply shortages, potentially upending earlier projections of a market surplus.

Andy Lipow, president of Lipow Oil Associates, noted on CNBC's "Squawk Box Asia" that market optimism, fueled by the recent U.S.-Iran memorandum of understanding, has diminished. "Those surpluses are certainly in jeopardy, especially if the strait would completely shut down," he stated.

Lipow estimates that if applied to crude oil cargoes, Trump's proposed fee could translate to an additional $16 per barrel for oil transported through the strait, although the exact implementation details from the administration remain unclear.

Oil prices year-to-date

Citi research warns that implementing such a fee could elevate the likelihood of a broader military confrontation in the short term. "It is our view that the risks of military escalation have risen materially should this announcement be implemented," Citi's analysts wrote, adding that the potential for Iran to withdraw from the MoU until after the U.S. mid-term elections has also increased, a scenario that could lead to prolonged higher oil prices.

Beyond the direct cost of the proposed fee, other experts emphasize the market's growing concern over the potential for actual supply losses due to escalating conflict. Henry Hoffman, co-portfolio manager at Catalyst Energy Infrastructure Fund, commented, "The immediate impact is obviously supportive of oil prices, but the more consequential issue is the risk of renewed physical supply losses."

U.S. West Texas Intermediate futures for August delivery saw a 2.27% increase, settling at $79.91 per barrel. Similarly, international benchmark Brent crude futures for September delivery rose by 2.14% to $85.11, extending previous session gains.

Vessel Traffic Falls Amid Tensions

Hoffman further highlighted that a continued decline in vessel traffic could compel producers to curtail output if storage capacity becomes exhausted due to an inability to export crude. Data from Kpler revealed a significant drop in vessel traffic through the Strait of Hormuz on Sunday, with only 14 ships, including four crude tankers, compared to 37 vessels the previous week.

"If exporters are unable to ship crude out of the Gulf, storage tanks can eventually fill up, leaving producers with little choice but to temporarily halt production," Hoffman explained. "That makes the effective supply loss potentially much greater than what can be measured simply by looking at damaged infrastructure."

These developments challenge the prevailing expectations from institutions like the International Energy Agency (IEA), which had anticipated a return to surplus in global oil markets by late 2026, contingent on a gradual recovery in tanker traffic through the strait.

The situation is particularly sensitive with potential rebounds in Asian demand coinciding with increased uncertainty surrounding Middle Eastern supplies. Saudi Arabia's recent price adjustments, including a $11 per barrel cut for its primary Asian crude grade, could incentivize Chinese refiners to boost purchases after a sharp drop in imports during the initial disruption. This could lead to a scenario where recovering Chinese demand meets increasingly unreliable Middle Eastern supply.