Oil Prices Rise as U.S.-Iran Ceasefire Negotiations Collapse
Washington, Tuesday, 18 August 2026.
Global oil prices jumped above $90 a barrel as a U.S.-Iran ceasefire expired on August 17, 2026. Daily ship transits through the critical Strait of Hormuz plummeted from a normal 130 to just three.
Market Reaction to Diplomatic Stalemate
On Tuesday, August 18, 2026, Brent crude futures climbed 27 cents, representing a 0.3% increase, to settle at $91.14 per barrel [1]. This price action follows a significant surge on Monday, August 17, when September WTI crude oil closed up 2.55% to $84.50 per barrel [2]. The current trading price of WTI at $85.04 reflects a 0.639 increase from the previous session’s close, indicating sustained buyer confidence amidst geopolitical tension [1][2]. Market analysts note that oil has jumped to start the week as U.S.-Iran relations look increasingly shaky, with a deal to reopen the Strait of Hormuz not yet in sight [1]. The dual chokehold on the Strait of Hormuz and the Bab el-Mandeb remains highly significant, sitting at the center of the current supply-risk narrative [1].
Collapse of the Memorandum of Understanding
The immediate catalyst for this volatility was the expiration of a 14-point Memorandum of Understanding (MoU) on August 17, 2026, which was originally signed on June 17, 2026 [2][6]. This agreement was intended to initiate a 60-day peace negotiation period following the start of major combat operations on February 28, 2026 [4][6]. While the MoU mandated an immediate and permanent termination of military operations, fighting has persisted, including reports of Israeli occupation of approximately 20% of Lebanon [6]. Iran’s Foreign Ministry spokesman confirmed that no extension talks occurred, citing U.S. violations of the agreement from the very beginning [2]. Consequently, the 60-day window for a final settlement expired without a deal, leaving the status of unprecedented sanctions promised by Treasury Secretary Bessent pending for the week of August 17 to August 23, 2026 [5][6].
Supply Chain Disruptions and Economic Outlook
Physical supply metrics highlight the severity of the disruption, with ship traffic through the Strait of Hormuz dropping to just three vessels on August 16, 2026, compared to a pre-war average of 130 vessels [2]. Following attacks on tankers, only five commodity vessels transited the strait on Saturday, with none registered for Sunday, versus 31 in the prior weekend [1]. This reduction correlates with China reducing its crude oil imports by 4 million to 5 million barrels per day, a factor that has previously suppressed global price surges during the conflict [2]. However, forecasts suggest Brent crude prices will likely rise toward $100 per barrel as China increases oil imports, ending this reduction [2]. Energy Secretary Chris Wright stated that the U.S. is playing the long game with Iran, while market analysts warn that an escalation could push crude toward $95, while a lull in strikes would quickly cap gains [3][5].