The oceans are the circulatory system of the world economy. More than 80 percent of global trade by volume still moves by ship. Energy, food, manufactured goods, and the cables that carry the digital economy all pass through a handful of narrow straits and open-sea lanes that, for eight decades, have been treated as open commons under the protection of American naval power. That assumption is now under sustained strain.
In his recent analysis, “Maritime Security Complexes: The Future of Global Seapower,” maritime historian and former merchant mariner Sal Mercogliano describes the new reality with unusual clarity: the maritime domain is fragmenting into overlapping security complexes in which naval doctrine, commercial shipping, and regional power politics can no longer be separated. This is not abstract theory. It is the operating environment of 2026.
An Evolving Maritime Architecture
Traditional naval strategy still centers on fleet-on-fleet engagements, sea control, and power projection. But the architecture of seapower is shifting. China’s shipbuilding dominance and growing naval presence, Russia’s shadow fleets and targeting of undersea infrastructure, and the proven ability of Iran and the Houthis to disrupt major routes are forcing navies to ask what “freedom of navigation” means in practice.
The old line between high-end warfighting and constabulary maritime security is eroding. Modern seapower must deter peer competitors, protect commercial traffic, and secure undersea infrastructure simultaneously. Doctrine that treats these as sequential or secondary missions is obsolete.
The result is a more multipolar, less permissive maritime order. States are no longer content to free-ride on a single guarantor. They are building their own capacity, forming regional arrangements, and treating sea lanes as instruments of leverage rather than neutral highways.
Chokepoints and Strategic Bottlenecks
Geography remains destiny at sea. The Strait of Hormuz, Bab el-Mandeb, Malacca, the Taiwan Strait, the Turkish Straits, and Arctic routes concentrate risk in ways open-ocean operations never can. Recent years have shown how cheap, asymmetric tools—anti-ship missiles, drones, mines, and the threat of boarding or seizure—can impose costs far out of proportion to an attacker’s conventional strength. Insurance premiums spike, ships divert, supply chains stretch, and energy and food prices ripple outward, often hitting developing economies hardest.
Mercogliano is right to stress the threat vectors across these corridors. The danger is not only closure but the steady normalization of disruption. What was once an episodic shock is becoming a structural feature of the environment. Meanwhile, shadow fleets operating outside traditional insurance, classification, and regulatory frameworks further erode the rules-based order that made just-in-time global logistics possible.
Coalitions and Interoperability
No single navy can police every contested sea lane. Multilateral partnerships are essential, yet they remain uneven and under-resourced. NATO’s updated maritime strategy, AUKUS, the Quad’s maritime initiatives, and assorted regional frameworks all seek to weave naval forces, intelligence sharing, and industrial capacity into something more coherent. The hard part is turning political declarations into persistent presence, shared operational pictures, and interoperable logistics under real pressure.
Interoperability is more than compatible radios and common tactics. It means protecting merchant shipping, coordinating with commercial operators, and surging forces to threatened chokepoints quickly. Without coalitions that can act at the speed of commerce rather than the speed of bureaucracy, deterrence weakens and free-riding returns.
Where Commerce Meets the Navy
This is the most underappreciated—and most consequential—element of the picture. Commercial and naval power have always been linked; Alfred Thayer Mahan understood that economic and military seapower reinforce each other. Today that link has become a vulnerability. The United States builds a negligible share of the world’s commercial ships and maintains a thin U.S.-flagged international fleet. China dominates global shipbuilding order books and operates the world’s largest commercial fleet. In a prolonged crisis, the side that can build, repair, and crew ships at scale holds a decisive advantage—both in sustaining military logistics and in preserving economic resilience.
Regional tensions do not stay regional. A threat to merchant vessels in one theater immediately moves freight rates, inventory decisions, and energy markets worldwide. Navies that treat merchant shipping as background will find, too late, that their own logistics and their nation’s prosperity depend on it.
The Path Ahead
These emerging maritime security complexes are not a passing disruption. They reflect deeper shifts in relative power, the spread of technology, and the willingness of revisionist actors to treat the maritime commons as contested space. If the present trajectory holds, the likely result is a more fragmented, costlier, and riskier system in which parallel regulatory, insurance, and security regimes coexist and undermine one another.
Managing that trend takes more than additional warships. It requires treating commercial shipbuilding, the merchant marine, port infrastructure, mariner training, and naval force structure as interdependent parts of national seapower. It requires sustained investment in coalitions capable of persistent presence rather than episodic deployments. And it requires honesty about a basic fact: freedom of navigation is not self-enforcing. It is a political and military outcome that must be produced again and again.
The oceans will not become less important. The question is whether the major maritime powers will adapt their strategies, industrial bases, and partnerships quickly enough to keep the system working under stress—or whether they will keep treating the sea as a secondary theater until the next crisis forces the issue. The future of global seapower will be decided less by the size of individual fleets than by the coherence of the security complexes that form around the world’s critical sea lanes.
Andrew Mwangura is a maritime security analyst and editor of the Maritime Business Review.