Japan’s Big-B push with Bangladesh: Why India is watching this Bay of Bengal strategy

What happens when Japan decides to deepen its economic and security footprint in Bangladesh, a country that sits at the crossroads of South Asia and Southeast Asia? For India, the answer could shape everything from connectivity to the Northeast to the balance of influence in the Bay of Bengal.

On October 27, Japanese Prime Minister Sanae Takaichi announced plans to upgrade the Bay of Bengal Industrial Growth Belt (BIG-B) initiative following talks with Bangladesh Prime Minister Tarique Rahman in Tokyo. She said the two countries would develop it into a new strategic cooperation initiative, emphasising regional connectivity, supply chains and investment. Takaichi also said Japan anticipated private investment totalling about 1 trillion yen over the next five years. Reuters reported last week that the proposed investment, worth around $6.36 billion, would target manufacturing, automobiles and energy infrastructure, although it could not independently verify the original report.

What is Japan’s Big-B initiative, and why is it being upgraded?

Launched in 2014, BIG-B aims to develop an industrial corridor connecting Dhaka, Chattogram and Cox’s Bazar, supported by infrastructure, investment and better connectivity. Japan’s development agency, JICA, describes Bangladesh as a potential gateway linking South Asia with Southeast Asia and wider Indo-Pacific markets. The initiative has also involved Japanese development financing for infrastructure projects.

The latest announcement gives the existing framework a stronger strategic dimension. Takaichi identified connectivity, preparedness for disasters and geopolitical risks, economic growth, and regional peace and stability as priorities. Japan also highlighted maritime security cooperation and assistance through its security cooperation programmes.

The economic backdrop matters. Bangladesh and Japan signed an Economic Partnership Agreement in February 2026, creating a framework to expand trade and investment. The two governments are now looking to implement it and attract further Japanese capital.

Why does Japan’s Bangladesh strategy matter to India?

The first impact is connectivity. Bangladesh borders India’s Northeast, a region separated from much of mainland India by a narrow corridor. Better roads, ports, rail links and industrial infrastructure in Bangladesh could make it easier to move goods between the Northeast, the rest of India and Southeast Asian markets. Japanese-backed development could therefore complement India’s Act East policy, provided the projects are connected to Indian networks and cross-border cooperation progresses.

The second impact is strategic. The Bay of Bengal is important for maritime trade, energy routes and the wider Indo-Pacific balance. Japan’s emphasis on resilient supply chains, maritime security and regional stability reflects its interest in a more connected region and in limiting excessive dependence on any single power.

That is significant for India, which has its own strategic and economic interests in the Bay of Bengal. However, the initiative is not automatically an anti-India project. JICA says BIG-B is intended to complement other regional cooperation frameworks, rather than replace them.

Could this create a new challenge for India amid China’s influence?

Japan’s deeper engagement could offer Bangladesh alternatives for investment, infrastructure and technology beyond its existing partners. That matters as regional powers compete to build economic and strategic relationships across South Asia.

India’s immediate concern, however, is not simply how much money Japan invests. It is whether New Delhi remains connected to the emerging transport, trade and industrial networks. A report by Bangladesh’s The Daily Star on October 22 said Japanese officials were expected to push for India’s re-inclusion in BIG-B, reflecting Tokyo’s interest in a wider regional framework. That possibility is important, but it should not be mistaken for confirmation that India has already been formally brought back into the initiative.

What happens next for India-Bangladesh ties?

The timing is notable because relations between New Delhi and Dhaka have been strained since Sheikh Hasina’s government fell in August 2024. India and Bangladesh continue to share practical interests in trade, border management, water-sharing and regional connectivity, but political tensions have complicated cooperation. NDTV reported on October 23 that a visit by Rahman to India could take place in late November or early December, although the schedule was not confirmed.

For India, Japan’s upgraded Big-B push could become either a useful bridge or a missed opportunity. If New Delhi, Tokyo and Dhaka coordinate infrastructure and trade links, the initiative could strengthen regional supply chains and open markets for Indian businesses. If India remains outside key planning and connectivity arrangements, it risks losing influence over how the Bay of Bengal’s economic geography develops.

The crucial question is therefore not whether Japan is getting closer to Bangladesh. It is whether India can turn that growing partnership into a wider regional opportunity.

(With inputs from ANI)