Trump threatens strikes on Iran’s infrastructure by April 7 deadline over Hormuz closure

Trump’s Ultimatum

U.S. President Donald Trump issued a direct warning to Iran on April 7, 2026, threatening to strike its energy and transportation infrastructure within a single night if Tehran did not reopen the Strait of Hormuz by the deadline. The deadline marked the last opportunity for an agreement ensuring unimpeded oil transit through the Gulf. Trump emphasized that Iran’s refusal to negotiate would lead to irreversible consequences, following the recovery of two U.S. F-15 crew members from southern Iran, which he described as a heroic operation. The warning came amid tensions with NATO allies, whom he accused of failing to support U.S. efforts.

Military Escalation

“Iran’s foreign ministry labeled U.S. threats as war crimes and warned of a severe and disproportionate retaliation.”

Military operations between the U.S. and Israel against Iran targets have continued since 2023, with over 13,000 strikes conducted. A major escalation occurred on June 22, 2025, during Operation Midnight Hammer, a U.S. Air Force and Navy campaign targeting Iran’s nuclear facilities, including the Fordow Uranium Enrichment Plant and the Natanz Nuclear Facility. The strikes used 14 GBU-57A/B bunker-busting bombs carried by B-2 Spirit stealth bombers and 30 Tomahawk missiles fired from a submarine. This was followed by Operation Epic Fury in February–March 2026, which involved over 5,000 strikes on Iranian missile sites, defense infrastructure, and naval assets. Iran retaliated with missile attacks on Israeli and Gulf allies, including Saudi Arabia, the UAE, and Kuwait, causing significant damage to energy infrastructure. The U.S. Maritime Administration and the United Kingdom Maritime Trade Operations warned that military activity and electronic interference had created a highly volatile maritime environment, increasing risks for commercial vessels navigating the strait.

Legal Concerns Over Civilian Targets

Over 100 international legal experts, including university professors and legal scholars, warned that U.S. and Israeli strikes on Iran’s civilian infrastructure, such as bridges, steel mills, and medical facilities, may violate international law. In April 2026, these experts issued an open letter condemning the targeting of essential civilian structures as a deliberate violation of protections under the Geneva Conventions. Concerns centered on four areas: direct attacks on civilian objects, failure to distinguish military from civilian targets, proportionality, and rhetoric that conflates the Iranian regime with civilian infrastructure. Specific incidents included the destruction of Tehran’s Pasteur Institute, a key vaccine production hub, and the shutdown of steel mills in Esfahan and Ahvaz, disrupting regional economies. The Iranian Red Crescent reported over 117,000 civilian units, including 93,000 homes, 316 health facilities, and 763 schools, damaged since the conflict began. The International Atomic Energy Agency raised alarms about risks to Iran’s Bushehr nuclear power plant, warning that damage could lead to a radiological accident. Both sides accused each other of targeting civilian infrastructure, with legal experts and the U.N. citing potential violations of international law. Iran’s foreign ministry labeled U.S. threats as war crimes and warned of a severe and disproportionate retaliation.

Economic Impact of Hormuz Closure

The Strait of Hormuz, a 167-kilometer-long waterway, is the sole maritime link between the Persian Gulf and the open sea. Its closure has triggered a global economic crisis, with oil prices surging and supply chains disrupted. Between 180 and 200 tankers are stranded near the strait, and Iran has declared the waterway closed, threatening to fire on ships passing through. The U.S. Energy Information Administration estimated that 20 million barrels of crude oil and 80 million tonnes of LNG transited through the strait daily in 2024, representing one-fifth of global oil production and one-fifth of global LNG trade. The blockade has caused oil prices to spike, with Brent crude reaching $83.84 per barrel and potentially rising to $100. Freight costs for VLCCs (very large crude carriers) surged to $420,000 per day, up from $120,000, while LNG shipping prices rose 40% due to stranded vessels. China, Japan, and South Korea, which rely heavily on Middle Eastern oil, face significant economic strain. China sources 5% of its crude oil exports to Europe from the region, Japan 95%, and South Korea 75%. The U.S., while importing 0.9 million barrels per day from the region—2% of U.S. petroleum liquids consumption—warned that further Iranian actions could trigger a ‘total destruction’ of Iran’s energy infrastructure, including power plants and bridges, if the country did not agree to a deal to reopen the strait.

Historical Context of U.S.-Iran Tensions

The conflict is part of a decades-long history of U.S.-Iran tensions, rooted in the 1953 CIA- and MI6-backed coup against Prime Minister Mohammad Mossadegh, who nationalized Iran’s oil industry. This intervention, aimed at ensuring Western control over Iranian oil exports, sowed distrust that deepened through hostage crises, wars, sanctions, and nuclear disputes. The 1979 Iranian Revolution, which ousted the Shah and led to the 444-day U.S. embassy hostage crisis, marked a turning point, ending formal diplomatic ties and setting the stage for decades of hostility. During the 1980s Iran-Iraq War, the U.S. provided covert military and economic support to Iraq, further straining relations. Post-9/11, the George W. Bush administration labeled Iran part of the ‘Axis of Evil,’ leading to sanctions, embargoes, and covert operations amid the Iraq War. The 2015 JCPOA nuclear deal temporarily eased tensions, but the Trump administration’s 2018 withdrawal and reimposition of ‘maximum pressure’ sanctions triggered an economic crisis in Iran, prompting further nuclear advances. The 2020 killing of Qasem Soleimani and the accidental downing of a Ukrainian plane by Iran further entrenched the cycle of sanctions, proxy conflicts, and military brinkmanship. These historical grievances underscore the complexity of the current standoff, where Trump’s ultimatum is not just a political maneuver but a continuation of a long-standing geopolitical rivalry. The MARAD and UKMTO warnings about electronic interference and military activity highlight the ongoing risks to global maritime security.

Human Toll of the Conflict

According to the Perplexity Answer Tool, 750 U.S. service members were killed or wounded during the 2023–2026 conflict, underscoring the human toll of the military campaign. The 2020 killing of Qasem Soleimani, a senior Iranian military commander, by a U.S. drone strike, intensified regional tensions and led to retaliatory attacks. The accidental downing of a Ukrainian plane by Iran in 2020 further complicated diplomatic relations, highlighting the risks of miscalculation in the region. These events, combined with ongoing military operations, have deepened the humanitarian crisis and raised questions about the long-term stability of the Middle East. The U.S. and Iran continue to engage in a cycle of escalation, with each side accusing the other of aggression, further complicating efforts to de-escalate the conflict.