Crude oil prices surged on Monday, April 20, 2026, following the reported closure of the Strait of Hormuz and the apparent collapse of a fragile ceasefire between the United States and Iran. West Texas Intermediate (WTI) crude futures rose 7.8% to settle at $90.38 per barrel, while Brent crude, the international benchmark, jumped 6.8% to $96.49 per barrel. The price spike effectively reversed a significant portion of the declines seen late last week when market participants had briefly anticipated a de-escalation of regional hostilities.
The primary driver for the rally was Iran’s decision to rescind its April 17 declaration that the Strait of Hormuz was completely open to commercial traffic. Tehran officials stated on Monday that the waterway is once again restricted, citing continued U.S. naval activity in the region as a breach of the standing truce. The Strait of Hormuz serves as the world’s most critical energy chokepoint, historically handling approximately 20% of global oil consumption. Iranian state media reported that the military command has re-established control over the passage, warning that any unauthorized vessels attempting to transit would be intercepted.
Tensions escalated over the weekend following a significant maritime incident in the Gulf of Oman. On Sunday, April 19, U.S. naval forces fired on and seized an Iranian-flagged cargo vessel. President Donald Trump confirmed the action on Monday, asserting that the ship had attempted to bypass a U.S. blockade of Iranian ports. The Pentagon described the move as a necessary enforcement of Operation Economic Fury, a naval blockade initiated in March to pressure the Iranian government into a permanent nuclear agreement. In response, Iran’s joint military command characterized the seizure as armed piracy and a direct violation of the ceasefire terms agreed to earlier this month.
The geopolitical friction has stalled diplomatic efforts intended to formalize a lasting peace. Iran’s foreign ministry announced on Monday that it would not send its delegation to Islamabad, Pakistan, for a second round of mediated talks that were scheduled to begin today. These negotiations were expected to address nuclear enrichment timelines and the permanent status of shipping lanes. The existing 10-day ceasefire, which was brokered by Pakistani officials on April 12, is currently scheduled to expire on April 22, leaving the status of future hostilities uncertain.
The impact of the closure extended across the global energy complex. European natural gas futures rose 11% to reach €43 per megawatt-hour in early trading, while U.S. gasoline prices reached a national average of $4.05 per gallon. U.S. Energy Secretary Chris Wright issued a statement on Monday confirming that the administration is monitoring domestic supply levels but warned that retail energy costs may remain elevated as long as the Hormuz corridor remains obstructed. Data from the analytics firm Kpler indicated that tanker traffic through the strait has fallen to approximately 3.8 million barrels per day, a sharp decline from the pre-conflict average of 20 million barrels.