Iran does not need to close the Strait of Hormuz to win. It only needs to make everyone else wonder how much disruption Washington will tolerate before Iranian coercion becomes a condition to be managed rather than a challenge to be defeated.
That is the danger in the latest U.S.-Iran understanding over Hormuz. The problem is not simply that Iran may violate the deal. The problem is that Tehran appears to understand the deal as a repeated game: probe, threaten, pause, collect concessions, and probe again.
The latest reports from the strait suggest the game is already underway. Tanker traffic has slowed again. Some vessels are switching off tracking systems. War-risk insurers are warning shipowners about the danger of Hormuz voyages. The International Maritime Organization has urged states not to recognize Iran’s attempt to assert control over traffic in the strait. Iran, meanwhile, continues to claim authority over passage, permits, and fees.
TRUMP DECLARES IRAN DEAL DEAD: WAS THIS THE PLAN ALL ALONG?
This is not a misunderstanding. It is a strategy.
To American diplomats, the memorandum of understanding was supposed to provide a path back from escalation: reopen the strait, restore commercial shipping, calm energy markets, and preserve talks with Tehran. Iran saw something else. It saw leverage.
Tehran’s question is not whether it can obey or defy the agreement in some clean, binary way. Its question is how much pressure it can apply while still forcing Washington to preserve the deal. A drone threat, a missile warning, a maritime delay, a toll demand, or a claim of authority over shipping routes should be understood in that context. These are not random outbursts. They are probes.
Iran does not need to sink the agreement. It only needs to teach Washington that enforcing the agreement is more trouble than preserving it.
That is how repeated games work. In a one-time bargain, compliance and violation may seem straightforward. In a repeated contest, every muted response becomes a lesson. A small violation that brings no serious consequence does more than break a rule. It tells the violator where the real line is.
In a repeated game, a weak response to a small violation is not restraint. It is instruction.
Tehran has mastered that logic for decades. It pushes below the threshold of decisive retaliation, waits to see the response, and then adjusts. It uses proxies, maritime harassment, deniable attacks, calibrated threats, diplomatic delay, and carefully worded ambiguity. It rarely needs a dramatic victory. It only needs each act of enforcement to look more destabilizing than the provocation that made enforcement necessary.
The Strait of Hormuz is now the test case.
The United States wants the strait open. Iran wants leverage over the strait. Washington wants to describe the agreement as de-escalation. Tehran wants to turn it into recognition of its gatekeeper role. Those are not different interpretations. They are incompatible objectives.
The ambiguity is the point. If the agreement says shipping must resume but leaves Iran room to contest routes, demand fees, intimidate vessels, or object to arrangements it does not control, then Tehran can comply with the form of the deal while destroying its purpose. That is not diplomacy. It is a permission structure.
The danger is not limited to oil prices or shipping delays. Iran is trying to change the psychology of the waterway. If shipowners, insurers, Gulf states, and Western governments begin to behave as though Iranian permission is a practical prerequisite for passage, Tehran will have gained a major concession without formally closing the strait.
That is why the insurance issue matters. Iran does not have to block every vessel. It only has to make passage expensive, uncertain, and politically risky enough that others begin to accommodate its demands. Coercion does not always look like a blockade. Sometimes it looks like a surcharge, a warning, a permit, an unexplained delay, or a transponder going dark.
The lesson will travel.
Hezbollah will study whether Iran pays a price for using commercial shipping as leverage. The Houthis will study it. Iraqi militias will study it. Hamas will study it. Every Iranian proxy will notice whether the United States imposes costs on Tehran’s aggression or merely manages around it.
Israel will notice too, but from the receiving end.
For Israel, the problem is not only Iran’s nuclear program, missile arsenal, or regional proxies. The problem is that American diplomacy too often treats Israeli restraint as the adjustable variable. When Iran escalates, Washington searches for a way to protect the diplomatic track. When Hezbollah threatens from Lebanon, Israel is urged not to widen the war. When Tehran tests the limits of an agreement, Israel is expected to avoid any response that might complicate Washington’s calendar.
Restraint can be wise. But restraint that teaches an adversary to escalate cheaply is not stability. It is tuition.
The United States does not need to abandon diplomacy. It does need to stop confusing paper agreements with changed incentives. A memorandum of understanding is useful only if it alters behavior. If Iran can threaten, obstruct, or tax shipping while still collecting the diplomatic benefits of the agreement, then the MOU is not restraining Iran. It is restraining everyone else.
A serious agreement would make the rules unmistakable: no tolls for passage through an international waterway, no Iranian veto over commercial shipping routes, no attacks on civilian vessels, no proxy pressure against Israel as a side channel of negotiation, and no financial or diplomatic reward for partial compliance.
Most importantly, there should be no expectation that Israel must absorb the strategic risk created by American ambiguity.
IRAN’S THREATS AGAINST TRUMP RAISE A QUESTION WASHINGTON CANNOT AVOID
This is not a choice between diplomacy and deterrence. It is a choice between diplomacy backed by consequences and diplomacy that becomes part of the adversary’s strategy. Iran is not confused about the game being played. It is testing the board, measuring the response, and learning from every hesitation.
The question is whether Washington understands that it is in the game at all.
Arie Blitz, M.D., M.B.A., is a retired physician and independent writer in Weslaco, Texas, who writes on foreign policy, medical ethics, and public policy.