Iran Declares the MoU Dead — Direct Strikes on US Bases, Tanker Warfare, and the Threat to Close Bab al-Mandab

The diplomatic scaffolding that was supposed to contain the Iran-US confrontation has collapsed. There is no remaining off-ramp. The war has widened, and two straits are now in play.

What Changed

As of mid-July, Iran has:

1. Struck US bases directly. Missile and drone strikes have landed on US installations in Bahrain, Kuwait, and Jordan. These are not proxy attacks. They are direct Iranian operations against US ground targets. The deterrence signal that kept the conflict confined to the Strait of Hormuz has failed.

2. Initiated tanker warfare in Omani waters. Iranian naval assets — fast attack craft and anti-ship missile batteries — are now targeting commercial tankers outside the Strait itself. This extends the disruption zone into the Gulf of Oman, widening the maritime risk premium beyond the narrow 21-mile chokepoint.

3. Threatened to close Bab al-Mandab. The southern strait — 20 miles wide, gateway to the Suez Canal, conduit for roughly 6 million barrels per day of crude and products — is now explicitly in Iranian targeting doctrine. Yemen-based assets (Houthi anti-ship missiles, Iranian-supplied drones) make this threat credible without requiring Iranian naval presence in the Red Sea.

The Diplomatic Frame Is Gone

The MoU — the memorandum of understanding that established a negotiation track between Washington and Tehran — had been under strain since late June. Iran has now formally declared itself no longer bound by it.

This is not a breakdown of negotiations. It is the end of the negotiating framework. The Anchorage/Vance formula, which was supposed to provide a diplomatic path to de-escalation in both the Iran and Russia/Ukraine theaters, no longer has an Iranian counterparty. There is no one to negotiate with on the terms that were being negotiated.

What Was Previously Believed

The June 26 digest assessed the MoU as “under strain” — Israel had defied Trump’s ceasefire request within 48 hours of the MoU signing, and Khamenei had publicly dissented. The working assumption was that the framework was damaged but repairable, and that the Vance channel could eventually produce a managed de-escalation.

That assumption is now falsified.

Markets

Rates. The branching path is binary: extraction or metastasis. The “managed geopolitical risk” middle — where Hormuz reopens in Q3 on a negotiated settlement — is no longer a scenario. What remains: either the US extracts (forced by munitions depletion — see separate dispatch) or the conflict metastasizes to Bab al-Mandab and dual-strait closure.

The initial market move is a bull flattener (flight-to-quality, 10Y-2Y compresses), but the correct medium-term trade is a bear steepener: oil price stickiness reprices inflation in the long end, while the front-end stays supported by recession-fear safe-haven bids.

Vol. Vol-of-vol rises. 1m10Y and 3m10Y straddles are bid because the branching path produces large moves in either direction. If extraction materializes, rates rally violently. If Bab al-Mandab closes, the long-end sells off in a dislocation. Own convexity on both sides.

Oil. WTI likely in the $75-85 range on Hormuz disruption alone. $100+ requires Bab al-Mandab closure or an Iranian strike on Saudi Aramco facilities. The Saudi de-escalation (see separate assessment) provides a partial safety valve on the dual-strait scenario, but the kinetic precedent — tankers in Omani waters, US bases hit — makes the threat credible enough to embed a permanent risk premium.

Helmer Bar: HIGH. The MoU collapse is confirmed by multiple sources and Iranian official statements. The strikes on Bahrain, Kuwait, and Jordan are independently reported.