The Iran war and disruption of the Strait of Hormuz are unlikely, on their own, to fundamentally reshape global trade. The maritime system remains deeply embedded in global energy flows and industrial supply chains and is resilient to episodic shocks. However, such events may accelerate a longer-term shift in China’s external economic strategy toward a corridor-hedging logic, in which connectivity is understood not as a single integrated system but as uneven, only partly substitutable routes that vary in usefulness under different geopolitical conditions.
This does not signal a move away from maritime globalization or an attempt to replace it with continental alternatives. Maritime trade remains dominant due to its scale, efficiency, and institutional depth. Instead, China is making a layered adjustment in which sea-based dominance persists but is complemented by selectively developed overland and semi-overland corridors designed to reduce exposure to chokepoint disruption. Within this structure, Iran occupies a structurally important but politically constrained position as a conditional transit space in a fragmented Eurasian connectivity landscape.
Chokepoint Exposure and the Structure of Vulnerability
The disruption of the Strait of Hormuz highlights a structural feature of China’s external economy that predates the current crisis: reliance on a small number of highly concentrated maritime passageways.
Even with the extensive diversification of China’s energy imports across the Middle East, Africa, and the Atlantic basin, the physical routing of these flows remains heavily concentrated. Most Gulf crude destined for East Asia must pass through the Strait of Hormuz before entering the Indian Ocean system. From there, a large share continues through the Strait of Malacca before reaching Chinese ports. This creates a layered chokepoint system in which diversifying supply sources does not remove the fact that the same goods still have to pass through a small number of key maritime routes further along the way.
China has long recognized this structural constraint. The “Malacca dilemma,” a notion articulated in Chinese strategic discourse in the early 2000s, reflected an awareness that the country remains heavily reliant on narrow maritime passageways that are vulnerable to obstruction.
The existence of these chokepoints has been common knowledge for decades, but the interpretation of them is changing. Vulnerability is increasingly assessed at the level of system-wide exposure across interconnected routes, rather than in terms of isolated supply relationships. Maritime continuity is viewed as something that must be actively managed under conditions of geopolitical uncertainty, including the possibility that multiple chokepoints could be stressed simultaneously.
At the same time, maritime systems remain structurally dominant. Their scale, cost efficiency, and integration into global production networks ensure that they will remain central to global trade for the foreseeable future. Far from seeking to replace them, the goal for Chinese policymakers is therefore to add alternative transport routes to supplement this still dominant maritime core.
Corridor-Hedging as Strategic Logic
Within this environment, China’s approach to external connectivity is best understood as a form of corridor-hedging logic.
Traditional diversification assumes that one route can replace another under changing conditions. Corridor-hedging recognizes that different routes perform different functions under different political and operational conditions. The objective is risk distribution across systems that are not interchangeable.
A key feature of this logic is temporal asymmetry, which reinforces the advantage of maritime trade. Sea routes can be scaled quickly because they are already embedded in global shipping, insurance, and logistics systems.
By contrast, overland corridors usually require extensive political coordination, infrastructure alignment, and regulatory harmonization before they can function effectively. This creates a lag between the rapid responsiveness of maritime transport and the slower activation of continental routes. Even during disruptions, overland systems tend to play a secondary role, absorbing spillovers over time rather than acting as immediate substitutes.
Three factors increasingly structure this corridor-hedging logic.
The first is geopolitical exposure: that is, referring to the vulnerability of a given corridor to sanctions, secondary sanctions, interstate conflict, or regulatory restriction. Routes crossing politically contested regions may remain economically viable in peacetime but become unreliable at times of conflict.
The second factor is scalability, or the extent to which a corridor can carry meaningful volumes of energy, commodities, and manufactured goods. Many overland routes remain structurally limited compared to maritime systems, regardless of political support or investment flows.
Third is redundancy value, which captures whether a corridor can meaningfully reduce systemic dependence on chokepoints under crisis conditions. Unlike efficiency metrics, redundancy value is inherently conditional and scenario-dependent.
Together, these factors produce a hierarchical connectivity structure rather than a unified system. Maritime routes remain primary arteries. Overland corridors function as partial buffers. Fragmented or emerging routes provide limited contingency capacity under specific conditions.
Iran as a Conditional Transit Space
Iran’s importance within this system derives from its position at the intersection of multiple corridor directions combined with its uneven availability as a transit space.
Geographically, Iran connects three major systems: 1) north–south routes linking Russia and Central Asia to the Indian Ocean; 2) east–west routes linking China to the Middle East and Europe; and 3) Caspian-linked routes connecting Central Asia and the Caucasus.
Iran’s role is not uniform across these systems. Its usefulness varies depending on direction and corridor configuration. In effect, Iran does not function as a single integrated transit hub but as a multi-directional system with uneven activation across transport axes.
This asymmetry is reinforced by a second-order constraint: Iran’s corridor value is not only directionally uneven but also episodically activated. Its relevance tends to increase during periods of maritime stress, sanctions adjustment, or regional disruption, and decline when alternative corridors regain reliability. In this sense, Iran’s position is structurally closer to a “surge capacity node” than a continuously operating hub.
This structural position is further complicated by external constraints. Sanctions regimes, regional instability, and shifting corridor investments continuously reshape Iran’s usability. These constraints do not originate in infrastructure itself but determine whether infrastructure can be reliably used.
Recent developments underscore this conditionality. Periodic sanctions relief or enforcement cycles can rapidly alter trade flows through Iran, while regional tensions can either increase its relevance as an alternative corridor or sharply reduce its accessibility.
Alternative routes reinforce these limitations. Trans-Caspian corridors require multiple transfers and fragmented logistics coordination. Northern routes through Russia face sanctions-related constraints and geopolitical uncertainty. Southern routes through Pakistan and Afghanistan remain limited by infrastructure gaps and security risks.
As a result, Iran does not function as a stable substitute for maritime systems, nor as a continuous corridor in its own right. Instead, it operates as a selectively activated transit space whose value increases during periods of disruption elsewhere in the system.
From a strategic perspective, Iran matters because it expands optionality under stress conditions, where even partial rerouting capacity becomes significant.
Corridor Fragmentation in Eurasia
The International North–South Transport Corridor (INSTC) is often described as an emerging Eurasian trade artery linking India, Iran, Russia, and Central Asia. In practice, however, it operates as a fragmented assemblage of partially connected routes shaped by different political, infrastructural, and regulatory environments.
Overland connectivity in Eurasia must operate across heterogeneous customs regimes, inconsistent regulatory systems, and uneven infrastructure development. Unlike maritime trade, which benefits from standardized global insurance, shipping norms, and deep logistical integration, overland systems remain institutionally fragmented by default.
Some segments of the INSTC, particularly those linking Indian Ocean ports to Iranian infrastructure, have expanded in recent years, but this has fallen short of full system integration.
The western segment remains constrained by missing infrastructure, especially the Rasht–Astara rail link between Iran and Azerbaijan, which continues to function as a key structural bottleneck for north–south flows. More broadly, the corridor lacks unified governance and integrated logistics systems, limiting its reliability as a continuous route.
As a result, the INSTC does not represent a replacement for maritime trade. It functions instead as a partial overlay system, valuable primarily under disruption conditions.
The Caspian region also illustrates the fragmented nature of Eurasian connectivity. Rather than forming a unified transport system, it functions as a space where multiple corridor networks overlap without integrating.
Three systems intersect here: 1) east–west routes linking China to Europe; 2) north–south routes linking Russia to Iran and the Indian Ocean; and 3) trans-Caucasus routes linking Central Asia to Turkey and the Mediterranean.
These systems remain operationally distinct. The Caspian therefore functions as a routing interface, where multiple logistical pathways intersect without merging into a unified network.
Both transport corridors reflect a broader pattern in how Eurasian transport networks are developing. Instead of becoming a single integrated system, connectivity is evolving into what can be described as overlapping but separate networks. Different transport corridors often run through the same general regions, but they do not fully connect into one coordinated system.
Continued Maritime Dominance
Despite incremental growth in overland infrastructure, maritime transport remains structurally dominant. Its advantages in scale, cost efficiency, and global integration ensure continued centrality in global trade.
Major maritime routes such as the Suez Canal and the Strait of Malacca handle volumes far exceeding all overland corridors combined. No continental system approaches comparable throughput capacity, nor is one likely to in the foreseeable future.
This dominance is reinforced by political and institutional constraints. Sanctions exposure, regulatory fragmentation, and geopolitical tensions – particularly involving Iran and Russia – limit the reliability and scalability of overland systems.
As a result, efforts to diversify transport routes remain structurally limited. Overland systems remain supplementary layers, which can provide only partial backup options in specific situations, such as regional disruptions or geopolitical tensions.
These conditions help explain why China may increasingly move toward a corridor-hedging logic in its external economic strategy. Faced with persistent chokepoint risks and growing uncertainty around maritime routes, connectivity is likely to be treated as a set of flexible options that can be adjusted under different geopolitical conditions. This does not imply a reduction in reliance on sea-based trade, but rather an effort to complement it with land-based alternatives that provide limited backup capacity during disruption.
Within this emerging structure, Iran occupies a distinctive but constrained position. Its geography places it across multiple transport systems, but its usefulness varies depending on the political conditions, security dynamics, and status of competing routes, giving it a role that becomes most relevant under stress rather than in normal conditions.
Overall, stability in the system does not depend on any single route or chokepoint. It emerges from the interaction of multiple incomplete and uneven pathways that together create resilience through flexibility rather than full integration.