Japan’s BIG-B Gambit: India’s Transit Stakes and the Bay of Bengal Power Game

The Bay of Bengal is no longer merely a maritime corridor. It is becoming a gateway to industrial growth, resilient supply chains and strategic influence across the Indo-Pacific. At its centre stands Bangladesh, whose location between South and Southeast Asia gives it an opportunity to become a regional manufacturing, logistics and trade hub.
Japan has now raised the stakes.

Following the October 27 Tokyo summit between Prime Minister Tarique Rahman and Japanese Prime Minister Sanae Takaichi, the leaders agreed to upgrade the Bay of Bengal Industrial Growth Belt (BIG-B) to “BIG-B for Shared Prosperity”, expanding cooperation on connectivity, industrial development, resilient supply chains and regional stability. 

The financial distinctions matter. The ¥1 trillion is a projection of future private investment, not money already fully committed or disbursed. Separately, the two countries announced loan projects worth approximately $295.5 million and signed a grant agreement worth up to ¥2.12 billion ($13.44 million) for a patrol vessel for Bangladesh’s Coast Guard. Seventeen private-sector memorandums of understanding were also signed during the visit. 

These represent separate instruments and business arrangements, not proof that the entire ¥1 trillion has been secured. The real geopolitical significance lies in what this partnership could build�"and how it might change regional connectivity.

Matarbari: The Gateway to a New Economic Order?
At the heart of BIG-B is the proposed development of the Matarbari�"Maheshkhali area into a major logistics, energy and industrial hub centred on the Matarbari deep-sea port. Japan sees Bangladesh’s potential as a bridge between South and Southeast Asia as important to its own economic interests. 

If port facilities, energy infrastructure and road and rail connections develop in tandem, Matarbari could help attract manufacturers, improve access to international shipping and connect Bangladesh more deeply with regional supply chains.

But a port alone cannot create an industrial powerhouse. Competitive port charges, efficient customs, reliable energy, modern transport links and predictable regulations will determine whether the investment generates productive industries or leaves Bangladesh with expensive infrastructure and unrealised potential.

he objective must be to connect infrastructure with production�"bringing factories, local suppliers, skilled workers and export industries into the same economic ecosystem.

Japan’s economic vision�"and its strategic calculation
Japan’s BIG-B initiative is rooted in economic development, but its regional significance cannot be separated from Tokyo’s wider Indo-Pacific priorities.

Japan depends on secure maritime routes and resilient supply chains. Deeper economic engagement with Bangladesh offers opportunities to strengthen manufacturing networks and connectivity around the Bay of Bengal. The upgraded framework also explicitly addresses geopolitical risks and cooperation for peace and stability. Tokyo has announced assistance involving a patrol vessel for Bangladesh’s maritime security. 

This does not mean BIG-B is simply a strategy to contain China. Its stated economic objectives are substantial in their own right. Nevertheless, ports, energy facilities and transport corridors can carry strategic significance alongside their commercial value.

That dual character will shape how New Delhi and Beijing assess the initiative.

India’s Northeast: The Transit Stakes
The regional equation becomes more consequential when India’s northeastern states enter the picture.
Separated from much of mainland India by the narrow Siliguri Corridor, the Northeast could benefit from efficient transport routes through Bangladesh to ports such as Chattogram and Mongla. India and Bangladesh already have agreements permitting the use of these ports for cargo moving to and from India, alongside established inland-waterway and transit arrangements. 

Japan’s broader connectivity vision could create further opportunities to link northeastern India with the Bay of Bengal through Bangladesh, potentially reducing logistics costs and strengthening trade with wider Asian markets. Matarbari could eventually complement this network, although any new arrangements would require appropriate infrastructure and bilateral agreements. 

For New Delhi, the benefits could be substantial: improved maritime access, more efficient cargo movement and stronger connections between the Northeast and international markets.

For Dhaka, the question is equally important: how can Bangladesh facilitate regional connectivity while securing a fair economic return?

Transit and port access can generate revenue, stimulate logistics and warehousing, and attract industries. But Bangladesh must also account for infrastructure costs, congestion, environmental pressures and the interests of domestic exporters. Agreements should establish transparent fees, reciprocal benefits and clear operational responsibilities.

There is no basis for assuming that India has opposed BIG-B or that new transit rights through Matarbari have already been agreed. The opportunity is to negotiate future cooperation on terms that benefit both countries.
Japan, China and India:

Competition or Cooperation?
Japan’s deeper engagement reflects its interest in secure maritime routes, resilient supply chains and stronger economic links across the Indo-Pacific. 

BIG-B’s upgraded framework also explicitly addresses geopolitical risks and regional peace and stability. Its economic objectives therefore carry wider strategic significance, even though the initiative should not simply be characterised as an effort to contain China. 

China remains a major economic partner of Bangladesh, while India has substantial trade, connectivity and security interests. Their priorities sometimes overlap and sometimes diverge. Ports, industrial corridors and supply chains can serve commercial purposes while also influencing regional strategic calculations.

The danger is that infrastructure and investment become instruments of geopolitical rivalry. The opportunity is that competition among partners gives Bangladesh greater access to capital, technology and markets.

Dhaka need not choose between Tokyo, Beijing and New Delhi. It must, however, ensure that each partnership advances its own development priorities, protects its economic interests and avoids excessive dependence on any single country.

Japanese technology, Chinese manufacturing capacity and Indian suppliers could, where commercially viable, contribute to interconnected regional production networks. Such cooperation would require transparent rules, commercially sound projects and respect for Bangladesh’s policy autonomy.

The Real Power Game: Who Sets the Terms?
The contest is not simply about which country invests the most. It is about who gains access to markets, shapes supply chains and helps determine the future economic geography of the Bay of Bengal.

Bangladesh could emerge stronger by attracting investment from multiple partners, developing competitive ports and building industries that create skilled employment and higher-value exports. But poor project selection, policy instability and weak implementation could squander the opportunity.

The government must therefore distinguish investment projections from signed agreements, actual capital inflows and operating businesses. It should subject major projects to transparent procurement, independent feasibility assessments and rigorous scrutiny of financing, environmental impacts and economic returns.

Above all, foreign investment must build domestic capabilities. Technology transfer, technical training, competitive local suppliers and stronger Bangladeshi enterprises should be central to BIG-B’s success.

Bangladesh’s Strategic Choice
Japan has signalled an ambitious investment horizon. India has established interests in regional transit and access to the Bay of Bengal. China remains a significant economic partner. Bangladesh sits where these interests intersect.

The decisive question is whether Bangladesh will become a strategic prize in the regional power game�"or an economic force capable of benefiting from it without becoming captive to it.

Bangladesh’s greatest strategic asset is not geography alone. It is the ability to convert geography into prosperity while retaining the freedom to determine its own future.