U.S. Strikes Iranian Tanker and Military Sites as Ceasefire Claims Collapse

U.S. military forces disabled an Iranian oil tanker in the Gulf of Oman on May 6 and struck Iranian missile facilities the following day, contradicting President Trump’s simultaneous claims of ceasefire progress and threatening to unravel diplomatic efforts to reopen the Strait of Hormuz.

The attacks occurred within 24 hours of Trump pausing the ‘Project Freedom’ naval escort mission, citing ‘great progress’ toward an agreement. An F/A-18 Super Hornet, according to The Hill, fired 20mm cannon rounds into the rudder of the M/T Hasna as it attempted to breach the U.S. blockade of Iranian ports. Iran’s military spokesperson called the action, according to CNBC, “aggressive, terrorist, and outlaw” and claimed immediate retaliation.

On May 7, according to CNN, U.S. Central Command reported that Iranian forces attacked U.S. Navy guided-missile destroyers transiting the strait, prompting American strikes on Iranian missile launch sites and command centers. Trump characterised Iran’s attack as a miscalculation: “They trifled with us today. We blew them away.”

The Contradiction at the Heart of Trump’s Strategy

The escalation exposes a structural tension in the administration’s approach. Trump simultaneously pursues diplomatic off-ramps while enforcing an oil blockade designed to strangle Iran’s primary revenue source. The tanker strike occurred as Washington circulated a one-page peace proposal, with Iran expected to respond within days.

The president framed both the tanker disabling and the subsequent facility strikes as defensive actions consistent with the ceasefire. “The ceasefire is going. It’s in effect,” Trump said on May 7, even as U.S. Central Command released imagery of destroyed Iranian missile batteries.

Iran disputes this characterisation entirely. Ebrahim Zolfaghari, spokesperson for Iran’s Khatam al-Anbiya Central Headquarters, according to Press TV, accused the U.S. of violating the ceasefire by targeting civilian shipping. Iranian military sources claimed their May 7 attack on U.S. destroyers was retaliation for the tanker strike, not unprovoked aggression.

Physical Oil Markets Detach From Futures

Brent crude futures reached $100.54 per barrel on May 8, according to Trading Economics, up 0.48% from the prior session. But the futures market understates physical supply stress. Dated Brent — crude for immediate delivery — traded above $130 per barrel, with some Middle Eastern grades exceeding $135, according to Rigzone.

The disconnect reflects expectations that the crisis will resolve quickly, even as physical barrels remain scarce. Intraday volatility on May 8 saw Brent swing from $108.80 to $96.80 per barrel — a $12 range suggesting traders are pricing in both escalation and resolution scenarios simultaneously.

Lloyd’s reported that the Strait of Hormuz remains effectively closed, with, according to CBS News, no transits recorded since May 4. The strait normally carries 20 million barrels per day, roughly 20% of global seaborne oil trade. The International Energy Agency warned that the conflict has disrupted 14 million barrels per day of global supply.

Ceasefire Credibility on Trial

The May 6-7 sequence raises questions about whether a functional ceasefire ever existed. U.S. Central Command characterised the tanker strike as blockade enforcement, not a ceasefire violation. Iran views any action against its shipping as an act of war.

This definitional dispute threatens the diplomatic track. Tim Huxley, chairman of Mandarin Shipping, told CNN that “the strait is still incredibly hazardous and I expect most ships will continue to avoid transit until both sides come up with something more concrete.” Without clarity on what constitutes permissible military action during negotiations, the ceasefire framework remains brittle.

The Trump Administration has given Iran a narrow window to respond to its peace proposal. If Tehran rejects the terms or demands modifications, the president has pledged to resume strikes “at a much higher level and intensity.” That threat now carries more credibility after the May 7 bombardment of Iranian military sites.

What to Watch

Iran’s formal response to the U.S. peace proposal is expected by May 9-10. Acceptance would likely trigger a rapid unwinding of physical oil premiums, with Dated Brent potentially reverting toward futures levels. Rejection sets up a resumption of U.S. strikes and a test of whether Brent can hold below $110 or breaks higher toward the $130+ levels seen in physical markets.

Shipping insurers are monitoring for any concrete framework defining permissible military actions during ceasefire periods. Without that clarity, commercial operators will continue avoiding the strait regardless of diplomatic statements. BMI analysts noted that “recent price action in Brent futures continues to reflect tension between physical tightness and shifting geopolitical expectations” — a dynamic that will persist until transit resumes or negotiations collapse entirely.

The contradiction between sanctions enforcement and diplomatic outreach remains unresolved. Trump’s willingness to strike Iranian assets while claiming ceasefire compliance suggests Washington views the blockade as non-negotiable. Whether Iran accepts those terms, or responds with its own definition of permissible wartime commerce, will determine whether the strait reopens or oil markets price in sustained triple-digit crude.