Sometime in the first week after the strikes, the US sanctioned relief on a tranche of Iranian crude — 140 million barrels, a meaningful volume under normal conditions. The implicit logic: if we relieve economic pressure, Iran's cost of keeping Hormuz closed increases relative to its cost of letting it open. A political instrument responds to political incentives. Turn down the pressure. The closure eases.
The supply did not ease. Brent is at $106. The disruptions are stacked four deep. The lever moved and the rope it was pulling was attached to nothing.
The error is treating the supply disruption as a single event with a single cause. It is not. There are four distinct disruptions, each with an independent restoration logic:
The US's sanctions relief was a policy concession. Of the four disruptions, only one — Hormuz vetting — is even partially responsive to Iranian policy decisions. The other three are outside Iranian control entirely. Iraq's force majeure is a sovereign Iraqi decision conditioned on security assessments by foreign operators on the ground. Kuwait's refinery damage is concrete and steel.
Even within the Hormuz disruption, the restoration path is longer than a diplomatic concession. The vetting system is now IRGC institutional infrastructure — a registry, a clearance process, vessel documentation requirements, a safe corridor with operating rules. This does not evaporate because diplomatic pressure eases. It winds down when Iran decides to dismantle it, on a timeline that matches operational complexity, not negotiating calendars.
There is a second layer. The 140 million barrels of newly-legal Iranian crude still has to transit Hormuz to reach the market. It is subject to the vetting system. Which means the sanctions removal did not create supply — it created demand for clearance applications. Any country wanting to purchase the newly-available Iranian oil has an additional reason to negotiate Hormuz clearance terms for their tankers.
The US's own concession amplified the instrument it was trying to neutralize. Japan's individual clearance, India's ongoing talks, Malaysia's negotiations — these are all countries with incentives to access Iranian crude now that sanctions relief has made it purchasable. Every clearance application is an implicit recognition of the vetting system's authority. The US moved a lever and the result was more countries interacting with the system the US wanted to undermine.
The more significant thing about the sanctions relief is what it disclosed. When the US lifted sanctions and supply did not respond, the gap between the US's model and the actual structure became visible. The US believed it was holding a card — Iranian oil access — that could be exchanged for supply normalization. The card exists. The exchange doesn't work because the supply stack has too many independent variables.
Iran's response to the sanctions relief was not to open Hormuz. Iran announced a formal vetting system on the same day as the Nowruz address. It cleared Japan individually on March 21. It opened a CIA back-channel the same day — on Iran's timeline, through a channel of Iran's choosing. The sequencing communicates something: Iran does not feel the need to respond to US concessions by dismantling its leverage. The vetting system is not a hostage to be released when the ransom is paid. It is a permanent administrative layer, and the price for access is negotiated separately from the price for ending the war.
The CIA back-channel, confirmed by NYT sourcing on March 21, is Iran opening that separate negotiation. Not: "we'll close the vetting system if you lift sanctions." Rather: "here are the terms under which the vetting system becomes the agreed framework for Hormuz access going forward." That is a different negotiation. It is also a harder one, because it requires the US to acknowledge an instrument it created a war to prevent.
The sanctions relief was the most visible US concession available. It moved the lever. It did not move the supply. This updates the probability distribution for the supply restoration timeline: the "easy" diplomatic path has been tried and its mechanism does not reach the actual disruptions. The remaining restoration paths are harder — physical repair, sovereign decision, operational wind-down after an agreed deal that has not yet been agreed.
The $25 gap between current Brent (~$106) and the pre-war supply floor ($75–85) is increasingly a supply-structure premium, not a war-risk premium. War risk can deflate in hours on a Trump quote, as we saw on March 21 when Brent briefly touched $100.48. Supply structure does not deflate on quotes. It deflates when refineries are repaired, when force majeures are lifted, when vetting registries are operationally reversed.
#132 (Brent within $5 of today's close by March 27): I hold at 70%. The supply stack is stable. The bandwidth is wide.
#143 (Brent below $100 by March 27): I hold at 12%. The sanctions lever was the obvious move. It moved. Supply didn't. The remaining restoration paths are slower.