India–Japan
Defence Partnership 2026:
From
Maritime Security to “Design with Japan, Make in India”
By Mitin Sheth
(Shanilohit)
INTRODUCTION
India and Japan are entering a new phase of defence
cooperation. What began as strategic dialogue and military exchanges is
evolving into practical collaboration in maritime security, defence technology,
industrial production and operational interoperability.
The August 20, 2026 meeting gave this cooperation a
more practical direction. Maritime security was one part of it, while the
UNICORN project opened another route for defence-technology cooperation. The
phrase “Design with Japan, Make in India” points to an ambition that goes
further still: Japanese technological strengths linked to India’s manufacturing
base. Whether that ambition produces equipment at meaningful scale will be a
more important measure of the partnership than the language used at bilateral
meetings.
EXECUTIVE SUMMARY
India–Japan defence cooperation in 2026 is no longer
centred primarily on dialogue and exercises. Maritime Domain Awareness, naval
logistics, UNICORN, shipbuilding, defence research, and increasingly complex
military exercises are fostering a broader security partnership.
For India, the attraction is practical. Japan brings
advanced defence technology and engineering experience; India brings
manufacturing scale and the operational knowledge of forces that work across
demanding maritime and continental environments. If the two sides can turn
those different strengths into equipment and systems they actually develop and
produce together, the relationship will have moved well beyond diplomatic
declarations. India can pursue that cooperation without turning it into a
treaty alliance or giving up its freedom to make independent strategic choices
***
India and Japan have spent decades building a
relationship defined by economic cooperation, political trust and a shared
interest in a stable Asian order. What is changing in 2026 is the depth of the
security component. The partnership is moving beyond diplomatic declarations
and periodic military exercises toward a more practical architecture that
involves maritime security, defence technology, ship maintenance, industrial
cooperation, and increasingly sophisticated operational coordination.
The shift was visible in New Delhi on August 20, 2026,
when Indian Defence Minister Rajnath Singh met Japanese Defence Minister
Shinjiro Koizumi. The most consequential outcome was the Memorandum of
Arrangement on Maritime Security Cooperation. It matters because India and
Japan are moving closer to the practical business of operating at sea—sharing
maritime awareness, supporting naval logistics and making cooperation between
their forces easier. Ship repair, defence technology and industrial research
were also discussed, but the maritime agreement was the clearest indication of
where the relationship is heading.
The importance lies less in any single weapon system
than in the direction of travel. India and Japan are beginning to connect their
strategic-level relationship with their respective defence-industrial
capabilities. Japan brings sophisticated maritime and electronic technologies,
while India offers a rapidly expanding defence-production ecosystem,
operational experience and a key location astride critical Indian Ocean sea
lanes. The result could become one of the more consequential defence
partnerships in the Indo-Pacific.
From Strategic Dialogue to Operational Cooperation
India and Japan did not arrive at their present level
of defence cooperation in a single leap. 2014 was an important turning point,
when the relationship was elevated to a Special Strategic and Global
Partnership. What followed was more significant than the terminology
itself.
In December 2015, the two governments signed the Agreement
concerning the Transfer of Defence Equipment and Technology, which came
into force the following year. Then, in September 2020, came the Acquisition
and Cross-Servicing Agreement (ACSA). This gave the Indian Armed Forces and
Japan’s Self-Defense Forces a framework for reciprocal logistical support. Taken
together, these agreements began giving practical military substance to a
relationship that had previously been driven largely by political and strategic
convergence.
Military interaction subsequently expanded through
exercises such as Dharma Guardian between the armies and JIMEX/JAIMEX
between the maritime forces, while Japan also participates with India, the
United States and Australia in the Malabar naval exercise. The third
India–Japan 2+2 Foreign and Defence Ministerial Meeting in 2024 pushed the
relationship further toward defence equipment, technology, cyber, space and
more complex military exercises.
The August 2026 meeting therefore does not represent
the beginning of a new relationship, but the acceleration of one that has been
developing for years.
Maritime Security Moves to the Centre
The most important immediate development is the new
maritime-security arrangement.
The Memorandum signed on August 20 creates a framework
for deeper cooperation between the Indian Navy and Japan Maritime Self-Defense
Force. It specifically includes information sharing in Maritime Domain
Awareness, as well as cooperation in Search and Rescue and Humanitarian
Assistance and Disaster Relief.
The two countries also agreed to strengthen
coordination to protect Sea Lines of Communication through naval visits,
joint exercises, personnel and specialist exchanges, and logistics-related
support involving ports and maintenance and repair facilities.
This matters because geography gives the partnership
unusual strategic relevance.
Japan depends heavily on maritime trade and energy
routes stretching from the Middle East through the Indian Ocean and onward into
East Asia. India sits close to several of the sea lanes through which that
traffic passes. For New Delhi, meanwhile, the Indian Ocean is increasingly
connected to developments farther east, including the South China Sea and Western
Pacific.
Neither country needs a formal military alliance for
their crucial interests to overlap. Both benefit from open sea lanes,
predictable maritime rules, better surveillance and greater ability to respond
to disruption.
The emerging partnership is therefore less about
creating an Asian version of a treaty alliance and more about building interoperability,
resilience and maritime awareness across a shared strategic space.
UNICORN: A Small System with Large Symbolism
One of the most visible elements of the relationship
is the UNICORN integrated communications antenna system for naval
vessels.
The project has been developing for several years. In
November 2024, Japan and India signed a Memorandum of Implementation for the
transfer of UNICORN to the Indian Navy under their defence equipment and
technology transfer framework. Japan describes UNICORN as a shipborne
integrated communications antenna system, and the August 2026 joint statement
identifies it as the first defence equipment transfer project between the
two countries.
That distinction is important. UNICORN should not be
presented merely as another piece of imported hardware. Its political
importance lies in Japan's willingness to deepen defence-technology cooperation
with India within the framework of its developing equipment-transfer policies.
Both defence ministers committed themselves to working
toward early realisation of the project. They also agreed that UNICORN should
not remain an isolated transaction. Discussions will continue between the
respective military services regarding operational requirements for additional
projects. At the same time, India's Defence Research and Development
Organisation and Japan's Acquisition, Technology & Logistics Agency are
expected to deepen research and development cooperation in advanced defence
technologies. A Defence Industry Forum is also envisaged.
In that sense, UNICORN could become less important for
what it is than for what may follow it.
“Design with Japan, Make in India”
Perhaps the most interesting phrase to emerge from the
August meeting was Koizumi's: “Design with Japan, Make in India.”
The formulation captures a potential transformation in
the relationship. Rather than India simply purchasing finished Japanese defence
systems, the two sides are examining ways of combining Japanese design and
technological expertise with India's manufacturing capabilities.
The ministers agreed to explore possible joint
development in naval shipbuilding and design, strengthen mine countermeasures
capabilities, and discuss greater Japanese use of Indian production capacity
under the Make in India framework. They also agreed to move toward reciprocal
ship-repair arrangements in Japan and India.
Prime Minister Narendra Modi reinforced the industrial
dimension when Koizumi called on him later that day. According to the Indian
government, Modi highlighted opportunities for Japanese companies to partner
with Indian firms and start-ups in defence co-development and co-production
under Make in India.
This could eventually prove more consequential than an
individual equipment sale.
India has spent years trying to reduce excessive
dependence on imported defence platforms as it expands indigenous
manufacturing. Japan, meanwhile, possesses advanced industrial capabilities yet
has historically operated under tighter restrictions on defence exports than
many Western suppliers.
If the two countries can develop a commercially viable
model that combines Japanese technology, Indian manufacturing, and carefully
selected joint projects, the partnership could create a new defense-industrial
corridor between two major Indo-Pacific economies.
The keyword, however, is "could".
Many of these projects remain at the stage of exploration, discussion or
implementation. Their planned promise should not be confused with completed
programmes.
From Exercises to Interoperability
Technology is only one side of the partnership.
Military familiarity is the other.
India and Japan already conduct bilateral army and
maritime exercises, but the 2026 agenda seeks to increase their complexity. The
two defense ministers agreed to pursue greater integration of unmanned systems
and, when opportunities arise, to organise exercises on shorter notice. They
also agreed to promote exchanges between their Special Operations Forces.
Another important development is Veer Guardian 26,
the planned bilateral air exercise. According to the August joint statement,
Japan Air Self-Defense Force fighter aircraft are scheduled to visit India for
the exercise—the first such Japanese fighter participation in India under this
bilateral framework.
Exercises matter because interoperability cannot be
created by diplomatic language alone. Forces learn how their counterparts
communicate, plan, organise logistics, and respond to operational problems
through repeated training together.
The goal is not necessarily to make Indian and
Japanese forces interchangeable. India continues to value national autonomy,
while Japan functions within its own constitutional, political and alliance
framework. The more realistic objective is to ensure that when their interests
converge—maritime surveillance, disaster response, sea-lane protection or wider
Indo-Pacific exercises—they can work together more effectively.
Beyond Bilateralism: A Wider Indo-Pacific Network
Another feature of the emerging partnership is that it
is no longer exclusively bilateral.
In February 2026, Japan, India and Indonesia conducted
their first trilateral naval PASSEX. The August defence ministers' statement
welcomed the exercise and called for greater cooperation with third countries
through exchanges, exercises and other initiatives.
The two countries are also participating in the Indo-Pacific
Logistics Network, intended to improve the movement of personnel and
supplies to partner countries during natural disasters. Their defence ministers
further agreed to deepen cooperation through the Japan–Australia–India–United
States (Quad) framework.
The distinction is important: the Quad is a strategic
grouping, not a formal military alliance. Its importance lies in the
increasing density of relationships among its members and their cooperation
across maritime security, technology, resilience, humanitarian response and
other areas.
For India, this networked approach has an additional
advantage. It allows New Delhi to strengthen practical cooperation with Japan,
Australia and the United States without abandoning its preference for national
autonomy.
Japan also has a practical reason to deepen defence
ties with India. Much of the sea traffic connecting East Asia with the Gulf and
Africa crosses the wider Indian Ocean, where India’s location and naval
presence carry obvious weight. Working more closely with New Delhi therefore
gives Tokyo a stronger partner in waters far beyond Japan’s immediate maritime
neighbourhood.
The China Factor—Important, but Not the Whole Story
No serious discussion of Indo-Pacific security can
ignore China's growing military and maritime capabilities. Both India and Japan
have distinct security concerns regarding China, and both oppose attempts to
alter the status quo by force or coercion. The August joint statement
explicitly reiterated opposition to unilateral actions that impede freedom and
safety of navigation and overflight.
Yet it would be too simplistic to portray the India–Japan
partnership as merely an anti-China arrangement.
The relationship also responds to broader structural
changes: increasingly contested sea lanes, vulnerabilities in supply chains,
rapid advances in unmanned and electronic systems, natural-disaster response
requirements, defence-industrial resilience, and the need for trusted
technological partnerships.
China is an important strategic variable. It is not
the sole explanation.
That distinction matters particularly for India, which
has traditionally resisted rigid alliance structures. New Delhi's emerging
security architecture is increasingly based on multiple partnerships rather
than dependence on a single bloc. Japan fits naturally into that approach
because it offers advanced technology, major economic capacity and overlapping
naval interests without requiring India to surrender strategic independence.
What Comes Next
The real test of the 2026 understandings will be
implementation.
UNICORN must move from agreement toward operational
realisation. Naval shipbuilding discussions must identify projects that make
technological and economic sense. Repair and maintenance arrangements need
workable procedures. DRDO–ATLA research cooperation must generate projects
rather than remain institutional dialogue. The proposed Defence Industry Forum
will need participants capable of connecting government aspirations with
industrial realities.
The new Director-General/Joint Secretary-level Working
Group established by the August meeting could therefore become important. It is
intended to coordinate cooperation across the operational, intelligence,
equipment, technology, and manufacturing domains while respecting the sovereign
policies of both countries.
That last qualification is revealing.
India and Japan are not becoming treaty allies. They
do not need to become treaty allies for the relationship to acquire strategic
weight. What is emerging instead is a practical partnership formed around areas
where national interests increasingly overlap.
Conclusion: From Strategic Trust toward Strategic
Capability
The next stage of India–Japan defence cooperation will
be judged less by the number of agreements signed and more by what happens
after them. Some of that progress will be visible at sea, some in defence
factories and research programmes, and some in how comfortably the two armed
forces can work together. Not every initiative will succeed, and progress is
unlikely to be uniform. That is precisely why implementation now matters more
than another declaration of strategic intent.
The Maritime Security Cooperation arrangement supplies
a framework for naval coordination. UNICORN gives defence-technology
cooperation its first tangible project. “Design with Japan, Make in India”
introduces the possibility of combining Japanese engineering with Indian
production. Ship repair, maritime domain awareness, mine countermeasures,
increasingly sophisticated exercises, and advanced R&D cooperation broaden
the relationship beyond a conventional buyer-seller model.
None of this guarantees that every proposed project
will succeed. Defence co-development is difficult even among long-established
allies. Technology-transfer restrictions, costs, industrial interests and
procurement procedures can slow ambitious plans.
But the strategic direction is becoming difficult to
miss.
India and Japan are gradually moving from strategic
trust toward strategic capability—not through a formal alliance, but
through a network of maritime, technological, operational and industrial
connections.
For the Indo-Pacific, that may ultimately matter more
than the announcement of any single defence deal.
ABOUT THE AUTHOR
Mitin Sheth (Shanilohit) is an Indian
author, geopolitical analyst and strategic book reviewer who has been
associated with the Janmabhoomi Group of Newspapers as a freelance Senior
Columnist for more than 25 years. He has written extensively on international
affairs, geopolitics and strategic issues. His work also focuses on defense and
military affairs, emerging technologies, global security, and India’s evolving
role in the international order.
Selected References
DISCLAIMER
This article is
an independent analysis based on publicly available information, official
statements, credible media reports, and open-source research. It is intended
for informational and analytical purposes only. The views and interpretations
expressed are those of the author. While every effort has been made to ensure
factual accuracy, developments may change as new information becomes available.
FULL DISCLOSURE
This is an
independently authored work. AI tools were used only for supportive tasks
(research, translation, editing, image generation, and grammatical/punctuation
correction). Final content and creative direction are the author’s own.
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2026 Mitin Sheth (Shanilohit). All rights reserved. Unauthorized
reproduction, republication or distribution without permission is prohibited.
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