The Legal Regime: Transit Passage under UNCLOS

The Strait of Hormuz qualifies as a strait used for international navigation connecting one part of the Exclusive Economic Zone (EEZ) to another. Under Part III of UNCLOS, vessels and aircraft enjoy the right of transit passage, which is broader than innocent passage. Transit passage cannot be suspended by coastal states, even in situations of heightened tension.

This distinction matters. Unlike innocent passage (under Articles 17–19), which is subject to certain regulatory controls and can be temporarily suspended for security reasons, transit passage (Articles 37–44) guarantees continuous and expeditious navigation. Coastal states may regulate safety, pollution control, and traffic separation schemes, but they cannot impede or suspend passage.

Iran has historically taken the position that transit passage rights do not apply absent ratification by relevant states and has at times signalled that it could close the Strait in response to external military pressure. While Iran is a signatory but not a ratifier of UNCLOS, the transit passage regime is widely regarded as reflecting customary international law. The United States, though not a party to UNCLOS, recognises transit passage as customary and conducts Freedom of Navigation Operations (FONOPs) accordingly.

This legal asymmetry, where key actors rely on customary norms while disputing formal treaty obligations, creates ambiguity in enforcement. What makes this asymmetry particularly destabilising is that it no longer appears exceptional. The contemporary international system is witnessing a broader thinning of constraint, where adherence to legal frameworks is increasingly calibrated to strategic convenience. Across domains such as maritime navigation, sanctions regimes, territorial assertions, trade controls, states have shown a growing willingness to reinterpret, stretch, or sidestep institutional rules when core interests are implicated. The architecture of international law remains formally intact, but its authority is unevenly internalised. The result is not overt legal collapse, but gradual erosion through selective practice. In such a climate, even entrenched doctrines like transit passage derive their stability less from treaty text and more from power equilibrium — an equilibrium that is far from guaranteed.

The Enforcement Vacuum

UNCLOS provides dispute resolution mechanisms under Part XV, including arbitration and recourse to the International Tribunal for the Law of the Sea (ITLOS). In theory, interference with transit passage could be litigated. In practice, much like many other international treaty obligations, enforcement is political. There is no supranational maritime police force. Compliance with transit passage norms depends on deterrence and coalition naval presence. If a coastal state effectively restricts passage through military signalling, harassment, or denial-of-access tactics short of a formal blockade, the injured state’s remedy is rarely judicial. It is strategic.

For India, this enforcement gap is the real vulnerability. India is a party to UNCLOS and a consistent advocate for freedom of navigation. Yet, unlike the United States, it does not maintain a permanent blue-water presence in the Persian Gulf capable of independently guaranteeing uninterrupted energy flows. Indian naval deployments under operations such as anti-piracy patrols have been significant but occasional. In a high-intensity conflict environment such as this, energy security becomes contingent on great-power naval dynamics.

India thus finds itself dependent on a legal regime whose enforcement is externalised.

Economic Transmission: Legal Instability as Price Risk

Market prices plummet before physical disruption occurs. A mere perception that transit passage may be impeded raises insurance premiums, freight rates, and forward oil contracts. The legal question — “Can the Strait be closed?” — becomes embedded in the performance of fiscal markets within hours.

For India, every sustained increase in crude prices translates into fiscal strain, current account pressure, and inflationary spillovers. The Reserve Bank of India must then recalibrate monetary policy and supply side policy. Refiners will face margin volatility. The rupee absorbs speculative pressure. None of this requires an actual naval blockade. It is merely dependent on legal uncertainty.

This is where the law of the sea intersects with financial markets. When transit passage appears fragile, sovereign risk assessments change. India’s vulnerability is not merely physical supply disruption; it is the financialisation of maritime insecurity.

Strategic Petroleum Reserves: A Temporal Buffer, Not Structural Immunity

India’s Strategic Petroleum Reserves (SPR) provide limited cushioning capacity. They are designed to mitigate short-term disruptions, not prolonged legal instability. An SPR can address weeks of disruption; it cannot stabilise multi-quarter price spikes driven by legal and geopolitical uncertainty. Moreover, SPR deployment is reactive. It does not reduce dependence on the Strait’s legal regime. It merely buys time. The deeper structural issue remains: India’s hydrocarbon import architecture is geographically concentrated through a chokepoint whose legal status, though formally robust under UNCLOS, is practically contingent on power politics.

The Technology and Infrastructure Dimension

For a technology-driven economy, energy security is foundational. Data centres, semiconductor fabrication, logistics networks, AI compute clusters, and manufacturing hubs are energy-intensive. Price volatility feeds directly into operational expenditure models and long-term power purchase agreements.

Indian hyperscale data centres rely on grid stability supported by thermal generation inputs linked to imported fuels and LNG. If LNG shipments through Hormuz are disrupted or repriced upward, downstream electricity tariffs may reflect that shock.

Thus, a maritime legal dispute in the Gulf can recalibrate India’s digital infrastructure economics. This is not a rhetorical chain but a contractual consequence. Energy procurement contracts often include force majeure clauses tied to geopolitical disruptions. Insurance contracts incorporate war-risk riders. Hedging instruments respond to perceived supply threats. A weakening of transit passage norms ripples through layered contractual ecosystems.

The Balancing Act

India has historically balanced relations among Iran, the Gulf Cooperation Council (GCC) states, and Western powers. It has invested in the Chabahar port in Iran while deepening energy and defence ties with Saudi Arabia and the UAE.

In a Hormuz crisis, India must simultaneously uphold freedom of navigation as a principle and maintain strategic partnerships with the United States and Gulf states without alienating Iran. This balancing act constrains India’s ability to overtly challenge any coastal assertion of restrictive control over the Strait. In effect, India relies on the stability of transit passage while having a limited appetite to militarise its defence. The most consequential risk is not a temporary disruption. It is the normalisation of “conditional transit passage” — where coastal states leverage geopolitical crises to test the elasticity of maritime norms.

If repeated episodes demonstrate that transit passage can be effectively throttled without sustained international consequences, customary law erodes. The rule becomes power-contingent rather than rule-based. For a trade-dependent state like India, whose economic model is export-oriented and energy-import reliant, the erosion of navigational freedoms is structurally risky.

Transit passage under UNCLOS is the invisible backbone of India’s energy supply chain. Its enforceability depends less on treaty text and more on geopolitical equilibrium. That equilibrium is increasingly volatile.

India’s long-term response cannot be limited to strategic reserves or diversified sourcing. It must include sustained blue-water naval capacity aligned with sea lane protection; actively participate in multilateral maritime security coalitions; diplomatically reinforce the right of transit passage as customary law; and accelerate diversification into non-Hormuz supply routes and renewable infrastructure.

Energy security in the twenty-first century is inseparable from maritime legal resilience. The Strait of Hormuz is a reminder that the stability of global trade is not guaranteed by markets alone — it is underwritten by norms, and those norms must be defended.