Don't believe the ink on the paper. Just days after Donald Trump and Iranian President Masoud Pezeshkian supposedly signed a groundbreaking Memorandum of Understanding (MoU) to end their 100-day war, the entire deal is teetering on the edge of collapse.
On Saturday, June 20, 2026, Iran’s Khatam al-Anbiya Central Headquarters—the top joint military command—abruptly ordered the complete closure of the Strait of Hormuz to all vessel traffic. The Islamic Revolutionary Guard Corps (IRGC) Navy followed up with a blunt warning: stay away from the waterway, or your security is at risk.
This happens right as negotiators from both sides are arriving in Switzerland for high-stakes technical talks meant to hammer out a permanent truce. Iran claims the closure is a direct response to a "blatant breach of trust" by the US and ongoing Israeli military operations against Hezbollah in southern Lebanon.
If you thought the global energy crisis was about to ease up, think again. The ultimate game of chicken in the Persian Gulf is back on.
The Friction in the Gulf vs. the Narrative in Washington
The situation on the water is chaotic, and depending on who you listen to, you're getting two entirely different realities.
Iran calls this shutdown its "first step" in retaliating against what it views as a violation of the 14-point MoU signed earlier this week. Under that agreement, a temporary April ceasefire was supposed to be extended by 60 days. Iran promised to gradually reopen the strait—which handles roughly a fifth of the world's oil and gas—and the US was supposed to lift its crushing naval blockade on Iranian ports.
Instead, overnight clashes in Lebanon threw a wrench into the gears. Hezbollah fired over 50 projectiles at Israeli forces, and Israel retaliated with heavy airstrikes that Lebanese authorities say killed at least 14 people, including children. Tehran views these strikes as a direct violation of the MoU's clause mandating an immediate halt to military operations on all fronts, including Lebanon.
But if you turn on American television, the message is completely different. Speaking to Fox News on Saturday, US Vice President JD Vance flatly disputed that the waterway was even blocked. Vance claimed Washington has seen "no evidence" that Hormuz is closed and expressed confidence that the ceasefire will hold.
To make matters more confusing, US Central Command (CENTCOM) released a statement claiming that commercial ship traffic through the strait actually increased on Saturday. CENTCOM noted that US forces are actively operating in the area to support freedom of navigation and ensure the agreement is obeyed.
So who's lying? Honestly, both sides are spinning the situation to maintain leverage. Iran uses the threat of total maritime shutdown to force Washington's hand before the Swiss negotiations begin. Meanwhile, the White House needs to keep global oil markets from panicking, so they pretend it's business as usual.
What is Actually Happening in Switzerland
Despite the brinkmanship in the Gulf, the diplomatic track hasn't totally derailed yet. An Iranian delegation led by top negotiator Mohammad Bagher Ghalibaf and Foreign Minister Abbas Araghchi is still arriving in Switzerland. They are joining Trump’s special envoy Steve Witkoff and Jared Kushner to salvage the deal.
The underlying economics explain why neither side has walked away entirely. The 2026 naval blockade has been costing Iran an estimated $500 million daily. They desperately need the economic relief and the oil waivers promised in the text. On the flip side, the US is dealing with a severe, war-induced global energy crunch. Trump needs that strait wide open to get oil flowing and bring down fuel prices back home.
But Iran's strategy is clear: they aren't opening the gates for free. Before the shutdown, Iran was already floating mandatory insurance fees and tolls on the strait, threatening to charge commercial vessels up to $2 million per transit. An advisor to Iranian Supreme Leader Mojtaba Khamenei made their stance obvious on social media, stating that the flow of oil will remain halted because the US "understands the language of economics and cost-benefit better."
The Real Chokepoint for Global Shipping
For international shipping companies, this back-and-forth is a total nightmare. Just on Thursday, 25 commercial vessels crossed the newly reopened strait—the highest traffic volume since mid-April. Shippers thought the danger had passed. Now, they are stuck holding their breath again.
This isn't just about regional politics; it's a massive stress test for global supply chains. If the IRGC Navy begins actively intercepting or threatening commercial ships again, insurance premiums will skyrocket to unpayable levels, effectively forcing a total blockade anyway, regardless of what CENTCOM claims on Twitter.
What to Watch Next
The next 48 hours will decide if this conflict roars back to life or cools down. Watch these specific markers to see where this is heading:
- The Swiss Technical Talks: Look for whether the US and Qatar move forward with a planned initial $6 billion financial package to Tehran. If that money gets frozen due to the Hormuz dispute, the MoU is dead.
- The Enforcement on the Water: Keep an eye on Lloyd's List and independent maritime tracking data. If commercial tankers stall out or reverse course in the Gulf of Oman, it means Iran's threat is real, and Vance's claims are empty rhetoric.
- The Security Zone in Lebanon: Benjamin Netanyahu has stated Israel intends to keep troops in a southern Lebanon "security zone" for as long as necessary. If Israel refuses to pause operations, Iran will likely keep the Strait of Hormuz locked down tight, rendering the broader peace deal completely useless.
