India-Japan Maritime Security Cooperation

India-Japan Maritime Security Cooperation was signed to strengthen the Indo-Pacific Partnership. Read here to learn more.

India and Japan share a Special Strategic and Global Partnership rooted in common democratic values, economic complementarities and a shared interest in maintaining a free, open and rules-based Indo-Pacific.

The recently signed Memorandum of Arrangement (MoA) on Maritime Security Cooperation seeks to institutionalise deeper cooperation between the Indian Navy and the Japan Maritime Self-Defense Force (JMSDF).

The agreement is significant not merely as a bilateral defence arrangement but as part of India’s broader strategy to strengthen maritime security, secure Sea Lines of Communication (SLOCs), enhance interoperability and promote a stable Indo-Pacific order.

India-Japan Maritime Security Cooperation

1. Maritime Domain Awareness

The MoA provides for enhanced cooperation in Maritime Domain Awareness (MDA).

MDA enables countries to develop a comprehensive understanding of activities occurring in the maritime domain, including:

• movement of naval and commercial vessels
• suspicious maritime activity
• illegal fishing and trafficking
• potential security threats
• emerging risks to maritime infrastructure

Greater information sharing between India and Japan can improve their ability to respond collectively to maritime challenges.

2. Protection of Sea Lines of Communication

The Indo-Pacific contains some of the world’s most important maritime trade routes.

For India and Japan, secure Sea Lines of Communication (SLOCs) are essential because both economies depend heavily on maritime trade and energy supplies.

The two countries intend to strengthen cooperation through:

• reciprocal naval visits
• joint exercises
• personnel and expert exchanges
• port access
• logistics support
• maintenance and repair facilities

Such cooperation can improve the operational reach and readiness of both navies.

3. Humanitarian Assistance and Disaster Relief

Maritime cooperation is not restricted to conventional military security.

India and Japan will also cooperate in:

• Search and Rescue (SAR)
• Humanitarian Assistance and Disaster Relief (HADR)
• disaster-response coordination
• Maritime emergency management

This is particularly relevant to the Indo-Pacific, which is vulnerable to cyclones, tsunamis, earthquakes and other natural disasters.

India’s experience in HADR operations and Japan’s advanced disaster-management capabilities can complement each other.

4. Naval Shipbuilding and Repair

An important emerging dimension is defence industrial cooperation.

India and Japan intend to explore:

• joint development in naval shipbuilding
• naval design cooperation
• reciprocal ship-repair arrangements
• greater utilisation of Indian shipyards
• cooperation under Make in India

This can combine Japan’s technological expertise with India’s growing manufacturing and shipbuilding capacity.

For India, such cooperation can contribute to:

• technology acquisition
• domestic manufacturing
• indigenous capability
• reduced dependence on imports.

5. Defence Exercises and Interoperability

Military exercises provide an important mechanism for developing interoperability.

The two countries plan to expand exercises such as:

• Dharma Guardian– Army exercise
• JAIMEX– naval exercise
• Veer Guardian– air exercise

The planned Veer Guardian 26 is particularly significant because Japanese fighter aircraft are expected to participate in an air exercise in India for the first time.

Future exercises are also expected to incorporate:

• short-notice operations
• more complex scenarios
• unmanned systems

This reflects a transition from traditional platform-based exercises towards multi-domain and technology-enabled warfare preparedness.

6. Defence Technology Cooperation

• India’s DRDO and Japan’s Acquisition, Technology & Logistics Agency (ATLA) are expected to deepen cooperation in advanced defence technologies.
• A Defence Industry Forum will provide an institutional platform for greater collaboration between defence industries.
• The UNICORN integrated communications antenna system is particularly important as a symbol of India-Japan defence-industrial cooperation and is being pursued as the first defence equipment transfer project between the two countries.

7. Special Operations and Theatre Commands

The agreement also envisages greater interaction between the two countries’ Special Operations Forces.

India and Japan may additionally explore cooperation with India’s integrated theatre commands once they are established.

This could facilitate greater coordination in:

• joint planning
• operational doctrine
• special operations
• intelligence sharing
• interoperability

Strategic Significance for India

1. Strengthening the Indo-Pacific

India and Japan share a commitment to a free and open Indo-Pacific.

Their cooperation seeks to discourage:

• unilateral attempts to change the status quo by force
• threats to freedom of navigation
• coercive behaviour in the maritime domain

Thus, bilateral maritime cooperation contributes to maintaining a rules-based maritime order.

2. Maritime Security

India’s geographical position gives it a central role in the Indian Ocean Region.

Closer cooperation with Japan can strengthen India’s ability to address:

• maritime security threats
• piracy
• illegal fishing
• trafficking
• threats to commercial shipping
• challenges to SLOC security

3. Defence Modernisation

Japan’s technological capabilities can complement India’s efforts towards:

• Atmanirbhar Bharat
• Make in India
• defence technology cooperation

Joint development, shipbuilding and repair cooperation can strengthen India’s domestic defence ecosystem.

4. Strategic Diversification

• India’s defence partnerships have historically involved multiple countries.
• Closer cooperation with Japan enables India to diversify its strategic partnerships while retaining its policy of strategic autonomy.

Significance for Japan

For Japan, India is an important partner in securing the wider Indo-Pacific maritime environment.

Japan can benefit from:

• India’s geographical position in the Indian Ocean
• India’s growing naval capabilities
• cooperation on SLOC security
• access to India’s ship-repair and manufacturing ecosystem
• greater coordination with a major regional power

India, meanwhile, benefits from Japanese technology, investment and industrial expertise.

Thus, the relationship represents strategic complementarity rather than a conventional military alliance.

Role of the QUAD

India and Japan are also members of the Quadrilateral Security Dialogue (QUAD) along with the United States and Australia.

India-Japan maritime cooperation can therefore contribute indirectly to wider QUAD objectives relating to:

• maritime domain awareness
• HADR
• resilient supply chains
• maritime security
• capacity building
• a free and open Indo-Pacific

However, bilateral cooperation remains distinct from the QUAD and should not be interpreted as creating a formal military alliance.

Challenges

Despite growing strategic convergence, several challenges remain.

China factor

• Growing Chinese maritime presence in the East China Sea and Indian Ocean Region provides an important strategic context to India-Japan cooperation.
• However, excessive securitisation of the relationship could increase regional tensions.

Different strategic priorities

• Japan’s primary security concerns are concentrated in the Western Pacific and East China Sea, whereas India’s principal maritime interests lie in the Indian Ocean Region.

Defence-industrial differences

• Technology transfer, intellectual property, cost, production standards and regulatory procedures can affect defence-industrial cooperation.

Interoperability

• Differences in military doctrines, communication systems and operational procedures require sustained exercises and institutional engagement.

Maintaining strategic autonomy

• India must deepen partnerships while avoiding dependence on any single strategic bloc.

Way Forward

India and Japan should focus on five broad priorities:

1. Institutionalise MDA cooperation through greater information sharing and coordinated maritime surveillance.
2. Expand naval logistics and repair cooperation to improve operational sustainability.
3. Deepen defence-industrial collaboration with greater technology transfer and domestic production.
4. Expand HADR and maritime capacity-building with other Indo-Pacific countries.
5. Maintain strategic autonomy while strengthening cooperation with like-minded partners.

Conclusion

The India-Japan Maritime Security Cooperation MoA represents an important evolution from conventional defence engagement towards integrated maritime security and defence-industrial cooperation.

Its significance extends beyond naval exercises. Cooperation in MDA, SLOC protection, HADR, shipbuilding, defence technology, logistics and interoperability can strengthen India’s maritime capabilities while contributing to a stable Indo-Pacific.

For India, the partnership offers an opportunity to combine Japanese technology and expertise with Indian manufacturing and strategic geography. For Japan, India provides an increasingly important partner in securing the wider Indo-Pacific.

Ultimately, the objective should be to build a secure, resilient, inclusive and rules-based maritime order, while preserving India’s strategic autonomy and avoiding unnecessary militarisation of regional competition.