India’s Strategic Interests in Sri Lanka: Balancing Security and Economic Ties

Just 30 kilometres separate the southern tip of India from the northern coast of Sri Lanka. That narrow stretch of water hides an outsized geopolitical reality. Sri Lanka sits astride some of the busiest sea lanes on the planet, carrying oil from the Gulf and containers between Europe and East Asia. For India, this island nation is not just a neighbour, it is a pivot point for security in the Indian Ocean. The relationship is shaped by deep cultural ties, strong trade links, and shared interests, but it is also tested by historical wounds, fishing disputes, and the steady advance of Chinese influence. Understanding how India balances these forces tells us a great deal about how it approaches its entire neighbourhood.

Why Sri Lanka’s location matters so much 🔗

Geography is the foundation of this relationship. Sri Lanka lies across the major sea lanes connecting Europe to East Asia and the oil tanker routes running from the Gulf to China, Japan, and other Pacific economies. The East-West maritime route passing around the island carries a huge share of global oil and container traffic, which makes the security of these waters directly tied to India’s own economic stability.

The strategic value of the island was recognised long ago. The British developed a major naval base at Trincomalee on the eastern coast precisely because of its position. For the Indian Navy, this matters in a very practical way. When fleets need to move between the Bay of Bengal and the Arabian Sea, they have to navigate around Sri Lanka. An unfriendly or hostile government in Colombo would create a serious strategic headache for New Delhi.

This is why India treats Sri Lanka as central to its broader maritime vision, including its SAGAR doctrine and its Neighbourhood First policy. The goal is to position India as a net security provider and first responder for the entire region, and a stable Sri Lanka is essential to that ambition.

The shadow of the civil war and the Tamil question 🔗

No discussion of this relationship is complete without the ethnic conflict that defined Sri Lankan politics for decades. The civil war between the Sinhalese-majority state and Tamil separatists raged from 1983 to 2009, ending only with the military defeat of the Liberation Tigers of Tamil Eelam (LTTE). The war killed tens of thousands and devastated the north and east of the island.

The Indo-Lanka Accord and the 13th Amendment 🔗

India’s involvement in this conflict was deep and at times painful. The turning point came in 1987 with the Indo-Lanka Accord, signed between Prime Minister Rajiv Gandhi and President J.R. Jayawardene. The accord recognised Sri Lanka as a multilingual, multi-ethnic society and led to the 13th Amendment to the Sri Lankan Constitution. This amendment made Tamil an official language and created elected provincial councils, intended to give Tamil-majority areas a degree of self-governance without breaking up the country.

The promise of meaningful devolution, however, was never fully kept. After the LTTE’s defeat in 2009, full implementation of the amendment became politically inconvenient for successive governments in Colombo, and the devolution of real power to the provinces remained unresolved. Many in the Sinhalese majority feared that giving the Tamil regions autonomy would encourage separatism.

Why this still shapes diplomacy today 🔗

India continues to press Colombo on this issue. Indian officials have repeatedly urged Sri Lanka to fully implement the 13th Amendment and to hold provincial council elections, while reaffirming support for the island’s unity and territorial integrity. This is a delicate balance. India must respond to the concerns of Tamil voters in its own state of Tamil Nadu, where the fate of Sri Lankan Tamils carries real political weight, while avoiding the appearance of interfering in Sri Lanka’s internal affairs. Tamil parties on the island continue to ask New Delhi to keep nudging Colombo toward the original spirit of the 1987 accord.

Strong and growing economic ties 🔗

If the war represents the difficult chapter, economics represents the bright one. India has long been among Sri Lanka’s largest trading partners. According to the High Commission of India in Colombo, merchandise trade between the two countries reached USD 5.54 billion in the 2023-24 financial year, with Indian exports forming the bulk of that figure. India is also one of the largest sources of foreign direct investment for Sri Lanka, with cumulative investment crossing USD 2.25 billion, spread across energy, hospitality, real estate, manufacturing, telecommunications, and financial services.

The lender of last resort in 2022 🔗

The depth of this partnership was tested dramatically during Sri Lanka’s economic collapse in 2022. The country faced its worst crisis since independence. Foreign reserves dried up, inflation crossed 50 percent, and in April 2022 Sri Lanka defaulted on its external debt for the first time in its history. Fuel shortages, power cuts, and food scarcity brought daily life to a standstill.

India stepped in as Sri Lanka’s most important source of emergency support. Through a combination of currency swaps, credit lines for fuel and food, and deferred trade payments, India facilitated around USD 4 billion in financing when no other country or institution was willing to do so. India also became the first country to provide a letter of support for Sri Lanka’s debt restructuring, helping unlock the path to an IMF programme. This moment reshaped how Colombo viewed its northern neighbour, and it gave India considerable goodwill and strategic leverage.

Deepening the partnership further 🔗

Beyond crisis relief, the two countries are working on long-term economic integration. Negotiations on the Economic and Technology Cooperation Agreement (ETCA) have continued across multiple administrations, aiming to expand cooperation in goods, services, investment, and technology. India has also pushed into new areas such as digital payment linkages and energy connectivity, including discussions on an electricity grid connection. Development projects funded by Indian credit, from railway lines to solar power initiatives, are visible across the island.

The fishing dispute in the Palk Strait 🔗

Not every issue is easily resolved. The fishing dispute in the Palk Strait remains one of the most persistent irritants in the relationship, and it directly affects the livelihoods of thousands of families on both sides.

What the conflict is really about 🔗

Fishermen from Tamil Nadu and Sri Lanka’s Northern Province have shared these waters for centuries. The trouble began after India and Sri Lanka delimited their maritime boundary in the 1974 and 1976 agreements, which drew an International Maritime Boundary Line through traditional fishing grounds. Indian fishermen, facing depleted stocks in their own waters, frequently cross this line into Sri Lankan territory. Sri Lanka banned bottom trawling in 2017, a method used by many Indian mechanised trawlers that drags weighted nets along the seabed, damaging coral reefs and depleting fish stocks.

The result is a recurring cycle of arrests. The Sri Lankan Navy regularly detains Indian fishermen and confiscates their boats. In 2024, the number of Indian fishermen arrested crossed 500 for the first time in a decade. For the affected families, this means lost income and seized vessels worth large sums.

The Katchatheevu factor 🔗

Tangled into this is the question of Katchatheevu, a small uninhabited islet of about 285 acres. India recognised Sri Lanka’s sovereignty over the island under the 1974 maritime agreement. Indian fishermen retain limited rights to use it for drying nets and resting, but politicians in Tamil Nadu periodically demand its return, keeping the issue politically alive. While the sovereignty question is legally settled, the dispute is less about territory and more about livelihoods, ecology, and the clash between large commercial trawlers and small artisanal fishers. Both governments have set up joint working groups, but a durable solution has proved elusive.

The China factor and India’s biggest strategic worry 🔗

The single largest concern for India in Sri Lanka today is the expanding presence of China. Over the past two decades, Beijing has poured money into Sri Lankan ports and infrastructure through its Belt and Road Initiative, and these projects sit uncomfortably close to India’s southern coast.

Hambantota and the question of dependency 🔗

The most cited example is Hambantota Port. Built with Chinese loans, the port struggled commercially. When Sri Lanka could not service its debt, it handed China a controlling equity stake and a 99-year lease in 2017. Critics in India and the West described this as a textbook case of “debt-trap diplomacy,” warning that the port could one day serve Chinese naval purposes.

It is worth noting that the picture is debated. Some analysts argue the lease was driven by Sri Lanka’s own balance-of-payments crisis rather than a Chinese plot, and that the deal was a lease arrangement separate from the original construction loans. The Sri Lankan government has insisted the port remains under its sovereignty and even moved its southern naval command there. Still, the strategic anxiety is real, especially when combined with the Colombo Port City project, also backed by Chinese capital and built on reclaimed land.

How India responds 🔗

India’s strategy is one of soft balancing rather than confrontation. Instead of trying to shut China out directly, India works to make itself the more reliable and present partner. This includes securing involvement in projects like the Trincomalee oil tank farm and pushing forward energy and connectivity initiatives. New Delhi has also emphasised that Sri Lanka should protect its sovereignty and avoid over-reliance on any single external power, a message clearly aimed at the China relationship. When China suspended an energy project on islands off Sri Lanka’s northern coast, the move was widely read as a response to Indian concerns over its proximity to Tamil Nadu.

Building security cooperation 🔗

Defence and maritime cooperation form the other half of India’s approach. The two countries conduct regular joint exercises, including the Mitra Shakti army exercise and the SLINEX naval exercise, alongside the trilateral Dosti maritime drills. Sri Lanka’s coastal surveillance radars have been integrated into India’s Information Fusion Centre for the Indian Ocean Region, strengthening shared awareness of what moves through these waters.

India has also championed the Colombo Security Conclave, a grouping that brings together India, Sri Lanka, Mauritius, and the Maldives to coordinate on maritime security. These mechanisms serve a dual purpose. They genuinely improve regional security, and they keep India embedded as a partner of first choice, making it harder for any rival power to displace its influence.

The balancing act 🔗

India’s policy toward Sri Lanka is ultimately an exercise in managing competing pressures at the same time. It must support Tamil reconciliation without alienating the Sinhalese majority. It must deepen trade and investment while gently warning against the costs of Chinese dependency. It must resolve the fishing dispute in a way that protects livelihoods on both sides of the boundary. And it must provide security cooperation without appearing to dominate a smaller neighbour.

What ties all of this together is a simple strategic logic. A friendly, stable, and prosperous Sri Lanka serves India’s deepest interests in the Indian Ocean, while a Sri Lanka pulled too far into another power’s orbit would be a lasting vulnerability. The 2022 economic rescue showed that when the moment demanded it, India was willing and able to act as the partner Colombo could count on. The challenge ahead is to convert that goodwill into durable cooperation that survives the shifting coalitions and political winds of Sri Lankan politics.

What do you think? Is India’s strategy of soft balancing, offering itself as a more reliable partner rather than confronting China head-on, the smartest long-term approach in the Indian Ocean? And should the resolution of the Tamil reconciliation and fishing disputes take priority over the larger geopolitical contest, or are they all part of the same balancing act?

References

1. https://www.britannica.com/place/Hambantota-port
2. https://www.newsonair.gov.in/india-sri-lanka-bilateral-relationship-captures-indias-vision-for-entire-indian-ocean-region-high-commissioner-of-india-to-sri-lanka-gopal-baglay
3. https://www.vifindia.org/article/december/07/The-13-th-Amendment-of-Sri-Lanka-and-India-Sri-Lanka-Relations
4. https://thediplomat.com/2023/07/sri-lankas-reconciliation-efforts-get-stuck-in-the-13th-amendment-again/
5. https://www.hcicolombo.gov.in/page/india-sri-lanka-bilateral-relations/
6. https://www.orfonline.org/expert-speak/india-sri-lanka-economic-relations-the-rise-of-a-digital-and-financial-partnership
7. https://thediplomat.com/2023/07/india-as-a-lender-of-last-resort/
8. https://www.drishtiias.com/daily-updates/daily-news-analysis/india-sri-lanka-fishing-dispute-and-way-forward
9. https://www.drishtiias.com/daily-updates/daily-news-analysis/india-sri-lanka-fishing-dispute
10. https://www.nextias.com/ca/current-affairs/12-02-2025/india-sri-lanka-fisheries-dispute
11. https://www.csis.org/analysis/game-loans-how-china-bought-hambantota
12. https://thediplomat.com/2020/01/the-hambantota-port-deal-myths-and-realities/
13. https://www.insightsonindia.com/2025/04/07/india-sri-lanka-relation/