India and Japan are deepening their strategic partnership beyond the usual diplomatic channels, with sub-national ties and defense cooperation emerging as the quietest but most durable pillars of their relationship. As the two nations prepare to mark 75 years of diplomatic ties in 2027, their collaboration is no longer confined to national capitals but is being driven by state and prefecture-level agreements that cut across defense, clean energy, and economic security.
The shift toward sub-national diplomacy reflects a deliberate effort to build resilience in bilateral relations. While national policies often shift with political cycles, partnerships between Indian states and Japanese prefectures operate on a more stable footing, grounded in local economic needs and shared interests. This approach has gained momentum in recent years, with Uttar Pradesh and Yamanashi Prefecture formalizing cooperation in green hydrogen, clean energy, and tourism—a model now being replicated across other regions.
### **A Partnership Built on Shared Values and Economic Ties**
India and Japan share a long history of cultural and political alignment, rooted in their commitment to democracy, tolerance, and open societies. Their relationship has evolved from wartime adversaries—when British-ruled India fought Japan during World War II—to a strategic partnership that now spans defense, trade, and development assistance. Japan remains India’s largest provider of official development assistance (ODA), with bilateral trade reaching **$17.63 billion in 2017**, though recent figures suggest growth in sectors like infrastructure and technology.
The foundation for deeper cooperation was laid in **2006**, when then-Prime Minister Manmohan Singh elevated ties to a **”Strategic and Global Partnership”** during a visit to Tokyo. This was further strengthened in **2014**, when Prime Minister Shinzo Abe upgraded the relationship to a **”Special Strategic and Global Partnership”**—a recognition of their converging interests in the Indo-Pacific. Since then, the two nations have expanded their collaboration in defense, with joint naval exercises like **Malabar 2007** (which included the U.S. and Australia) signaling a shared commitment to maritime security.
### **Sub-National Diplomacy: The New Frontier of Cooperation**
While national-level engagements remain important, sub-national diplomacy is now a key driver of India-Japan relations. The **Joint Vision for the Next Decade**, signed in **2025**, explicitly highlights state-prefecture partnerships as one of eight key lines of effort. This shift reflects a broader trend: local governments are increasingly taking the lead in economic and technological collaboration, reducing reliance on central authorities.
A landmark example is the partnership between **Uttar Pradesh and Yamanashi Prefecture**, formalized in **December 2024** and reinforced in **August 2026** with a high-level delegation of over 200 Japanese officials. The agreement covers green hydrogen, clean energy, investment, and tourism—areas where both sides have complementary strengths. Similar initiatives have seen Indian chief ministers like **Haryana’s Manohar Lal Khattar (2016)**, **Bihar’s Nitish Kumar (2018)**, and **Assam’s Himanta Biswa Sarma (2025)** visit Japan to explore regional cooperation.
This approach offers practical advantages. Unlike national policies, which can change with political leadership, sub-national agreements are often more stable, driven by local economic interests rather than broader geopolitical shifts. They also allow for faster implementation of projects, from infrastructure development to skill training, without the bureaucratic delays that plague central government initiatives.
### **Defense and Economic Security: The Indo-Pacific Anchor**
The Indo-Pacific remains the focal point of India-Japan strategic convergence. Both nations view the region as critical to their economic and security interests, particularly as China’s assertiveness grows. Their bilateral architecture now includes over **70 dialogue mechanisms and working groups**, covering defense, economic security, critical technologies, and connectivity.
In defense, cooperation has expanded beyond naval exercises to include joint training and technology sharing. The **2007 Malabar exercise** was a precursor to deeper trilateral engagements with the U.S., while recent discussions have focused on **maritime domain awareness** and **counterterrorism** in the Indian Ocean. Economically, Japan’s investment in India’s infrastructure—such as the **Delhi Metro system**—has positioned Tokyo as a key partner in India’s push for self-reliance.
The **Northeast region of India** is another area of growing cooperation, with Japan identifying **Northeast connectivity and the Act East Forum** as priorities. This aligns with India’s **”Act East” policy**, which aims to strengthen ties with Southeast Asia, and Japan’s own efforts to deepen engagement in the region.
### **What Comes Next: A Decade of Shared Horizons**
As India and Japan prepare to celebrate **75 years of diplomatic relations in 2027**, their partnership is entering a new phase. The focus is no longer just on high-level summits but on **sustained, grassroots collaboration**—whether through state-prefecture ties, defense cooperation, or economic partnerships.
The challenge now is to translate this institutional density into tangible outcomes. With over **70 dialogue mechanisms** in place, the question is how to ensure these platforms deliver real results, particularly in **critical technologies, infrastructure, and Indo-Pacific security**. The coming decade will test whether sub-national diplomacy can remain a stable force amid global uncertainties—or if it will be overshadowed by broader geopolitical shifts.
For now, the signs are positive. From **green hydrogen deals in Uttar Pradesh** to **defense cooperation in the Indian Ocean**, India and Japan are proving that their partnership extends far beyond Delhi and Tokyo. As Prime Minister Sanae Takaichi noted during her **2026 state visit**, closer cooperation is not just desirable—it is increasingly necessary in an unstable world. The next steps will determine whether this quiet revolution in diplomacy can deliver lasting benefits for both nations.
Operationalizing Defense and Technology Cooperation
This institutional density provides the backdrop for the India–Japan Year of Shared Horizons, designated to mark the 75th anniversary of diplomatic relations in 2027.
Cooperation has expanded beyond naval exercises like Malabar 2007, which involved Australia, Singapore, and the United States, to include joint training and technology sharing. Recent discussions have specifically focused on maritime domain awareness and counterterrorism in the Indian Ocean, reflecting shared interests in Indo-Pacific security.
Economically, Japan’s investment in India’s infrastructure, such as the Delhi Metro system, has positioned Tokyo as a key partner in India’s push for self-reliance. Japanese firms like Yamaha, Sony, Toyota, Honda, and Suzuki have manufacturing facilities in India, with Suzuki partnering with Maruti Suzuki to become the largest car manufacturer in the Indian market.
As the partnership enters its next phase, the focus is on translating these high-level agreements into sustained operational cooperation in defense, economic security, and technology, ensuring that the bilateral agenda delivers tangible results for both nations.
Sources
- India–Japan relations
- Beyond Delhi and Tokyo: Why Sub-National Diplomacy Matters for India–Japan Ties | Japan Forward
- India and Japan at 75 Looking Ahead to the Next Decade Marking the India–Japan Year of Shared Horizons
Photo: Immediate source: MOFA/Japanese Embassy to South Africa, probable source: Cabine (CC BY 4.0)
