The Neo-Medieval Siege and the Hormuz Gambit

 The sources trace the historical lineage of the current crisis in the Strait of Hormuz not through modern legal theory, but through centuries of coercive maritime governance and raw power politics. This lineage connects the medieval Portuguese Empire, the 19th-century Danish Straits, and the 20th-century Montreux Convention to what the author calls a "neo-medieval" world of warring fortresses.

The Cartaz and the "Virtual" Siege

The most ancient root identified is the Portuguese cartaz (license) system invented by Afonso de Albuquerque in 1507.

• The Prototype: The Portuguese Estado da India was built on controlling maritime chokepoints like Hormuz, Malacca, and Aden through a brutal licensing system that monopolized trade.
• Modern Parallel: The sources argue that 21st-century geopolitics has reverted to this structural reality. Modern financial instruments, specifically SWIFT and dollar-based sanctions, are described as a "virtual cartaz" or a virtual siege designed to inflict economic starvation.
• The Collision: Iran’s physical closure of the Strait is presented as the "physical twin" to this virtual coercion. By seizing tankers in retaliation for "oil theft" (sanctions enforcement), Iran has matched the West’s virtual cartaz with a physical one, making global rules optional for all parties.

The Sound Dues and "Power Translation"

The sources point to the 1857 Copenhagen Convention as a critical precedent for how geographic leverage is converted into legal reality.

• Historical Tolls: For over 400 years (from 1429), Denmark levied "Sound Dues" on every vessel passing through the Øresund.
• The Precedent: When major powers finally moved to end the tolls, they did not argue Denmark out of them based on principle; instead, they paid Copenhagen to codify new rules.
• Iran’s Lesson: Iran views this history as evidence that "customary international law" is merely precedent codified by whoever holds the power. Iran is now testing whether the West still has the power to enforce its preferred UNCLOS "transit passage" rules or if they must yield to a new arrangement.

The Montreux Template: "Montreux-isation" of the Gulf

The most direct "playbook" for the "Hormuz Gambit" is the 1936 Montreux Convention, which gave Türkiye control over the Bosphorus and Dardanelles.

• Strategic Realism: Türkiye weaponized "geographic anxiety" to regain sovereign militarized control over its straits as the League of Nations' architecture collapsed.
• The Gambit: Iran is attempting a "Montreux-isation" of Hormuz, seeking to convert its physical position into permanent immunity from great-power rivalry. This involves a three-phase strategy:
  1. Creating an uninsurable environment through threats and harassment, making "free passage" economically fictional.
  2. Establishing a "Permitted List" through bilateral deals with sympathetic nations like China and India.
  3. Exhausting adversaries until they capitulate to a new "Hormuz Convention" that grants Iran and Oman joint regulatory authority.

Conclusion: The Neo-Medieval Order

This historical lineage suggests that the "rules-based order" is being replaced by "negotiated interdependence". In this emergent order, sovereignty is not a universal right but a status negotiated based on leverage. The "Emergent Montreux of the Gulf" would formally hand the keys of the strait to Iran and Oman, trading ideological claims of "open seas" for the pragmatic necessity of keeping global oil and gas flowing.

In the provided sources, Weaponized Interdependence is defined as the process by which global economic networks—both physical and virtual—are transformed into instruments of state coercion. The "Hormuz Gambit" represents a fundamental collision between two different "organising pillars" of this interdependence: the virtual chokepoints of global finance and the physical chokepoints of geography.

The Virtual Cartaz: Weaponizing the Financial Stack

The sources argue that the "wardens of the virtual commons" (Western powers) were the first to weaponize the technological infrastructure of global trade.

• The Virtual Siege: By instructing SWIFT to disconnect Iranian banks in 2012, the West operationalized a "virtual siege" designed to inflict economic starvation through financial exclusion.
• Sanctions Enforcement: This virtual weaponization extended to "sanctions enforcement," such as the 2023 seizure of the Suez Rajan in international waters based on the use of US correspondent banking rather than physical territory. The author describes this regime as a modern "virtual cartaz," echoing the 16th-century Portuguese licensing system used to monopolize Indian Ocean trade.

The Physical Twin: Iran’s Geographic Retaliation

The "Hormuz Gambit" is presented as Iran’s calculated response to this virtual coercion. Iran has matched the West’s financial weaponization with a physical weaponization of geography.

• Symmetric Coercion: Just as the US used virtual networks to seize Iranian oil, Iran used its physical control of the Strait of Hormuz to seize American-linked cargo (the St Nikolas). This created a "physical twin" to the virtual cartaz, making global rules-based systems optional for all parties.
• Inflicting Systemic Pain: Iran’s closure of the Strait weaponized the global energy and fertilizer supply chains. This exposed the "strategic blind spots" of a hyper-financialized global market that assumed perpetual free maritime passage. No financial derivative can substitute for a physical barrel of crude once the chokepoint is closed.

The "Emergent Montreux" as Negotiated Interdependence

The sources suggest that the endgame of this weaponized collision is a transition from "fortress siegecraft" to a new form of negotiated interdependence.

• The Montreux Template: Taking a cue from Türkiye’s control of the Bosphorus, Iran is attempting to "Montreux-ise" the Gulf—converting its physical position into permanent diplomatic leverage.
• The Price of Order: In this emergent order, the "rules-based" ideal of open seas is sacrificed for the pragmatic necessity of keeping molecules flowing.
• Mutual Capitulation: The ultimate resolution is described as a "negotiated disarmament of competing cartazes". This involves the US removing its virtual financial blockade in exchange for Iran relinquishing its physical geographic siege.

Impact on Middle Powers

This weaponization has forced "middle powers" (such as India, Saudi Arabia, and Türkiye) into a "cartel of the non-aligned". These nations are increasingly unwilling to pay the "American security subscription" while absorbing the economic costs of Western weaponized finance. Instead, they are seeking bilateral arrangements—such as Saudi Arabia’s currency swap with China—to insulate themselves from the "virtual cartaz" while maintaining access to physical energy flows.

The Architecture of Legal Conflict in the Strait of Hormuz is defined not by a lack of rules, but by a collision between two competing, legally sanctioned rulebooks that turn every ship transit into a potential casus belli. This legal duality ensures that both the United States and Iran are simultaneously breaking each other’s laws while strictly obeying their own.

The Core Collision: UNCLOS vs. 1958 Geneva

The fundamental structural conflict arises from two irreconcilable maritime doctrines:

• Transit Passage (US Position): Based on UNCLOS Part III (Articles 37-44), the US maintains that warships have an unimpeded right to transit in "normal mode". This allows submarines to remain submerged and aircraft to overfly without the coastal state’s permission or the right to suspend passage.
• Innocent Passage (Iranian Position): Iran rejects the UNCLOS framework and relies on the 1958 Geneva Convention, which allows a coastal state to suspend transit if it deems a vessel’s passage "prejudicial to its peace, good order, or security". This framework requires submarines to surface and fly their flags and prohibits military overflights.

The Copenhagen Paradox and Article 35(c)

A critical "irony" in this architecture is the Copenhagen Paradox, which Iran uses to undermine the universality of UNCLOS.

• The Exception: UNCLOS Article 35(c) explicitly states that its general transit rules do not apply to straits regulated by "long-standing international conventions".
• The Precedent: The 1857 Copenhagen Convention, which ended Denmark's 428-year-old "Sound Dues," is recognized as such an exception.
• The Iranian Argument: Iran argues that because international law already acknowledges that all straits are not governed by the same rules, there is a legal foundation for a specific "Hormuz Convention" separate from UNCLOS. This suggests that "customary international law" is simply precedent codified by whoever held power at the time.

Mirror Legal Frameworks and Economic Warfare

The legal architecture has expanded to include a "mirror legal framework" where domestic laws are weaponized on the high seas.

• Sanctions as Aggression: Iran treats US "sanctions enforcement"—such as the seizure of the Suez Rajan—as a prior act of war and a violation of human rights.
• Retaliatory Law: On this basis, Iran utilizes its own legal system to authorize the seizure of American-linked cargo (such as the St Nikolas) as a lawful countermeasure rather than a provocation. This tit-for-tat operation has made the global "rules-bazaar" optional for all parties.

The Co-Belligerent Trap

The legal architecture of the conflict also ensnares regional "middle powers" through the co-belligerent trap. Under the Hague Conventions, any state allowing its territory to be used as a base of operations (such as Qatar, Bahrain, or Kuwait) arguably forfeits its neutral status. Iran uses this legal basis to declare naval blockades against their ports while maintaining that it has not blocked "neutral" commerce.

The Endgame: "Montreux-isation"

The sources suggest the resolution to this legal deadlock is the "Montreux-isation" of Hormuz.

• Realism over Idealism: Mirroring Türkiye’s 1936 revision of the Lausanne Treaty to regain control of the Bosphorus, Iran seeks to convert "geographic anxiety" into a permanent legal status.
• The Proposed Convention: An emergent "Hormuz Convention" would likely replace UNCLOS transit passage with the 1958 innocent passage framework, granting Iran and Oman joint regulatory authority and potentially the right to tax transit.
• De-facto to De-jure: The global order may eventually sacrifice its "ideological claims to an open sea" to ensure energy security, formally codifying Iran's geographic reality into a new established convention.

The Turkish Playbook serves as the strategic template for the "Hormuz Gambit," providing a real-world example of how a geographically pivotal state can convert its physical position into permanent immunity from great-power rivalry. This playbook rejects legal idealism in favor of raw realism, a move Iran is now attempting to replicate to achieve a "Montreux-isation" of the Gulf.

The 1936 Template: Weaponizing Geographic Anxiety

The playbook originated with the 1936 Montreux Convention, which saw Türkiye regain sovereign militarized control over the Bosphorus and Dardanelles.

• Leverage through Threat: Faced with the collapse of the League of Nations' security architecture, Atatürk weaponized "geographic anxiety" by issuing an ultimatum: grant Türkiye control over the straits or it would fortify them unilaterally, potentially siding with the Axis powers.
• The Compromise: The resulting accord was a "masterclass in compromise" that stabilized the region by restricting non-regional naval access (benefiting the Soviets) and securing Türkiye’s alignment away from the Axis (benefiting Britain and France).

The Modern Execution: Naval Kill-Switches and Energy Hubs

The sources highlight how Türkiye has recently updated this playbook during the war in Ukraine, demonstrating the enduring power of geographic leverage.

• The Naval Kill-Switch: By invoking Article 19 in February 2022, Türkiye officially closed the straits to belligerent warships, effectively turning the Black Sea into a "Turkish lake" and stranding Russian naval assets.
• The Energy Hostage: Türkiye elevated itself from a transit country to a gas hub by commingling molecules from Russia, Azerbaijan, and Iran. This designation of "Turkish Gas" allows European nations to technically comply with sanctions while still consuming Russian energy, revealing the impotence of regulators to close the loop.
• The Geopolitical Landlord: This combination of naval and energy leverage allows Türkiye to extract "retainer fees"—such as US approval for F-16 modernization—not based on shared values, but as a payment to a "geopolitical landlord".

Replication in the Gulf: The Hormuz Gambit

Iran’s "Hormuz Gambit" follows this playbook by creating a situation where the global order must eventually capitulate to Iranian regulatory authority to ensure energy security.

• Economic Exclusion via Insurance: Just as Türkiye uses legal articles, Iran uses the insurance markets. By maintaining a "prohibitively uninsurable environment" through harassment and threat, Iran has made "free passage" economically fictional without needing to fire a single shot.
• Negotiated Interdependence: The endgame is a "Hormuz Convention" that replaces the UNCLOS transit passage regime with a more restrictive framework (the 1958 Geneva Convention). This would grant Iran and Oman joint authority to tax transit and ban the nuclear-powered ships that form the backbone of the US Fifth Fleet.

The sources conclude that this "mutual capitulation" is the modern equivalent of Montreux: a move from "fortress siegecraft" toward a negotiated interdependence that recognizes the hard reality that the virtual financial order can no longer ignore the physical geographic order.

In the sources, Montreux-isation refers to Iran's strategic replication of the Turkish template to convert its geographic position into permanent diplomatic and regulatory leverage. This process, designed to dismantle the post-1945 illusion of a frictionless maritime commons, proceeds through three distinct phases.

Phase 1: The Prohibitively Uninsurable Environment

The first phase involves making the concept of "free passage" economically fictional without necessarily resorting to a total physical blockade.

• Weaponizing Risk: By maintaining a constant threat through drone swarms, naval harassment, and selective seizures, Iran forces the insurance markets to do the work of a blockade.
• Market-Driven Exclusion: The source notes that the Lloyd’s of London’s Joint War Committee’s war-risk designations are more effective than naval orders; by making the environment uninsurable for certain vessels, Iran achieves de-facto exclusion while letting market forces bear the administrative burden of the siege.

Phase 2: The Construction of a "Permitted List"

The second phase shifts from universal exclusion to a selective, bilateral system of maritime governance.

• Quiet Recognition: Iran establishes arrangements with sympathetic or pragmatic nations that guarantee their safety in exchange for an acknowledgment of Iranian regulatory authority.
• The Non-Aligned Shift: This phase is supported by the actions of middle powers; for example, China vetoing UN resolutions, India deploying its own escorts rather than joining US-led coalitions, and Saudi Arabia loosening the petrodollar tie through currency swaps with China. This creates a "partition of maritime governance" where different rules apply to different flags.

Phase 3: Exhaustion and Capitulation

The final phase is reached when the global order can no longer sustain the economic and political costs of an unmanaged, unpredictable siege.

• The Tipping Point: Just as Europe yielded to Türkiye in 1936 due to the unsustainability of the security crisis, the modern global order is expected to move toward "mutual capitulation".
• The Hormuz Convention: This phase concludes with the codification of a new "Hormuz Convention" or "Hormuz Maritime Authority". This proposed framework would replace the UNCLOS transit passage regime with the 1958 "innocent passage" framework, grant Iran and Oman joint regulatory authority, and potentially allow for the taxation of transits and the banning of nuclear-powered warships.

The Outcome: Negotiated Interdependence

The sources argue that this progression leads to a world where sovereignty is no longer a universal right but is negotiated based on leverage. The endgame of Montreux-isation is the transition from "fortress siegecraft" to a negotiated interdependence. In this emergent reality, the "wardens of the virtual order" (the West) are forced to trade sanctions relief for the physical reopening of the Strait, effectively handing the sovereign keys of the waterway to the littoral states to ensure the global flow of energy.

The sources characterize Global Energy Planning Blind Spots as a systemic failure of import-dependent nations to account for the physical realities of geography, having been lulled into a false sense of security by decades of market idealism. In the context of the Hormuz Gambit, these blind spots have transformed from theoretical risks into catastrophic economic disruptions.

The Illusion of the Singular Rulebook

A primary blind spot identified in the sources is the belief in a universal maritime rulebook.

• Competing Realities: Planners operated on the post-1945 illusion of a "frictionless multilateral commons". In reality, there is no single rulebook, but rather competing legal frameworks—such as the UNCLOS vs. 1958 Geneva collision—designed to balance asymmetric interests.
• The Assumption of "Open" Waters: Global economies, from Tokyo’s factories to India’s transport sector, have operated on the tacit, flawed assumption that the Strait of Hormuz is "ordained to remain open" by divine right rather than negotiated power.

The Failure of Hyper-Financialization

The sources argue that the energy sector's move toward hyper-financialized spot markets created a massive strategic vulnerability.

• Peacetime Flaws: These markets were built on the assumption of perpetual global surplus and guaranteed maritime passage.
• Physical vs. Paper: Hormuz demonstrated that when physical deliveries cease, the spot market "vaporises". No sophisticated derivative instrument or "paper oil" can substitute for an actual barrel of crude failing to transit the strait. By April 2026, markets reportedly saw a $50 per barrel premium on physical crude over quoted futures.

The Fallacy of Alternative Routes

Energy planning often assumes that alternative logistics can mitigate chokepoint risks, but the sources dismiss these as largely impractical:

• The Northern Sea Route: This is described as a "physical impossibility" for large-scale substitution due to extreme seasonality, ice-class vessel constraints, and poor voyage economics.
• The Cape of Good Hope: While a viable path, it merely transfers vulnerability. It requires a 50-day voyage to Europe with insurance premiums described as being "in the stratosphere".
• The LNG Virtual Cartaz: When Qatar’s supplies are impacted, buyers are forced into the "virtual cartaz" of Western finance, exposing them to US domestic price spikes and Henry Hub volatility.

The Indo-Pacific Arc of Dependence

The Hormuz Gambit has exposed a shared vulnerability among Asian giants—specifically Taiwan, Japan, South Korea, India, and China—forming what the author calls an "Indo-Pacific arc of dependence".

• The End of the Public Good: Under the "Donroe Doctrine" (a transactional version of the Monroe Doctrine), the US may no longer see a rational incentive to maintain the Fifth Fleet as a "perpetual public good" for Asian consumers.
• Negotiated Access: This blind spot forces these nations to move toward the "Emergent Montreux" model, where they must abandon ideological claims of an "open sea" and negotiate their own transit arrangements directly with the regional "geopolitical landlords" (Iran and Oman) to avoid absolute darkness.

The sources describe an Emergent Global Order that is fundamentally departing from the post-1945 multilateral ideal, characterized instead by a "Neo-Medieval" world of "distrustful warring fortresses". In this order, the "rules-based" system is being replaced by a reality where geopolitics is governed by the raw brutality of the siege and the strategic use of chokepoints.

The key features of this emergent order, as detailed in the sources, include:

1. The Death of Universal Sovereignty

The most significant shift in the new order is the abandonment of the illusion that sovereignty is a universal right guaranteed by a multilateral rulebook.

• Negotiated Status: Sovereignty is no longer "granted" but must be negotiated purely on the basis of leverage.
• Power over Principle: Customary international law is redefined not as a "gift of reason" but as precedent codified by whoever holds the power at a given time.
• The Iranian Paradigm: Iran has asserted this new paradigm by proving that a physical chokepoint (Hormuz) can neutralize a virtual financial blockade (SWIFT), meaning sovereignty now belongs to the state capable of making the denial of its territory prohibitively costly for adversaries.

2. The Rise of the "Cartel of the Non-Aligned"

The emergent order is increasingly shaped by "middle powers"—such as India, Türkiye, Saudi Arabia, and Indonesia—who are moving toward a "cartel of the non-aligned".

• Ending the "Security Subscription": These nations are performing a strategic calculation, questioning when the cost of the "American security subscription" becomes untenable while they absorb the consequences of American geopolitical choices.
• Tactical Independence: Their winning condition in the new order is a world where they can trade with China, buy weapons from Russia, and sell to the U.S. without needing permission from any of them. Examples include India's use of its own naval escorts and Saudi Arabia’s currency hedging with China.

3. The "Donroe Doctrine" and Transactional Security

The sources identify an emergent American posture dubbed the "Donroe Doctrine"—a fusion of the Monroe Doctrine's sphere-of-influence logic with contemporary transactionalism.

• End of the "Public Good": In this framework, the U.S. treats the Eastern Hemisphere as a marketplace rather than a protectorate. There is no longer a "rational incentive" for the U.S. to maintain the Fifth Fleet as a "perpetual public good" that secures energy transits for Asian consumers.
• Acquiescence to Local Control: The logical conclusion of this doctrine is a quiet U.S. acquiescence to a regional "Hormuz regulatory authority," compelling import-dependent nations to negotiate their own transit arrangements and bear their own security costs.

4. An "Indo-Pacific Arc of Dependence"

A byproduct of this shift is the emergence of an "Indo-Pacific arc of dependence", consisting of economies (Taiwan, Japan, South Korea, India, and China) whose shared vulnerability at the Hormuz chokepoint compels them into a new regional energy security architecture. These nations are expected to accept almost any terms of passage—including Iranian regulation and taxation—to avoid "absolute darkness".

5. Transition to Negotiated Interdependence

The final stage of this emergent order is a move from "fortress siegecraft" toward "negotiated interdependence".

• Mutual Capitulation: The global order is forced to sacrifice "ideological dogma" to avoid systemic breakdown.
• Disarmament of Cartazes: The endgame is a "negotiated disarmament of competing cartazes," where the West removes its virtual financial blockade and sanctions in exchange for the physical reopening of the Strait. This represents the first codification of an era where both physical geography and virtual finance must be balanced through pragmatic calculation rather than hegemonic diktat.