India-Sri Lanka Relations: A Complete Overview

India-Sri Lanka relations are among the oldest and most layered bilateral bonds in the world. Separated by a strip of shallow sea barely 30 kilometres wide at its narrowest, the two island-and-mainland neighbours share more than two thousand years of religion, language, epic memory and trade. Buddhism travelled from the Gangetic plains to Sri Lanka, Tamil culture flowed across the Palk Strait in both directions, and the Ramayana ties the two lands together in popular imagination.

The modern relationship, however, has been shaped by far more than shared heritage. The Tamil question, the civil war, the Indian Peace Keeping Force, fishing disputes, the rise of Chinese investment and the 2022 economic crisis have all tested ties that are, at their core, rooted in geography and necessity. This overview walks through the history, the sensitive issues and the practical cooperation that define the relationship, and why both sides describe it as indispensable.

Quick Facts

Ancient Roots: Buddhism, the Ramayana and Shared Culture

The earliest and most enduring thread in India-Sri Lanka relations is spiritual. According to the Sri Lankan chronicles, the Dipavamsa and the Mahavamsa, Emperor Ashoka of the Mauryan dynasty sent his son Mahinda, a Buddhist monk, to the island in the 3rd century BCE. Mahinda met King Devanampiya Tissa and introduced the teachings of the Buddha. Soon afterwards, Ashoka’s daughter Sanghamitta, a nun, arrived carrying a sapling of the Bodhi tree under which the Buddha attained enlightenment.

That sapling was planted at Anuradhapura, and the Sri Maha Bodhi there is revered as one of the oldest continuously documented trees in the world. Buddhism went on to become central to Sinhalese identity, and Sri Lanka became a custodian of the Theravada tradition and of the Pali canon, which was committed to writing on the island. Pilgrims, monks and scholars moved between the two lands for centuries.

The Ramayana connection

In Hindu tradition, Lanka is the kingdom of Ravana, and the Ramayana narrates Rama’s journey south to rescue Sita. Sites across both countries are linked to the epic, and Sri Lanka has promoted a “Ramayana trail” for pilgrims and tourists. The story remains a powerful cultural bridge, whatever the historical debates around it.

Language, art and ties of the south

• Sinhala, the majority language, belongs to the Indo-Aryan family and has deep links with Pali and Sanskrit.
• Tamil, spoken by the northern and eastern Tamils and the hill-country Tamils, is shared with Tamil Nadu and has a literary tradition spanning two millennia.
• Dynasties such as the Cholas and Pandyas interacted with the island through trade, diplomacy and, at times, war.
• Temple architecture, classical dance, music and cuisine show a long history of exchange.

Geography and Strategic Position

Geography explains much about why this relationship matters. Sri Lanka lies just off the southern tip of the Indian peninsula, with the Palk Strait and the Gulf of Mannar separating it from Tamil Nadu. A chain of limestone shoals and islets known as Adam’s Bridge, or Ram Setu, stretches between Rameswaram island in India and Mannar island in Sri Lanka. Tradition associates this chain with the bridge Rama’s army built to reach Lanka, and it appears on many maps as a near-continuous causeway, though it is largely submerged.

Sri Lanka also sits astride the busiest east-west sea lanes of the Indian Ocean, which carry a large share of the world’s commercial shipping and energy supplies. Its harbours, including Colombo, Trincomalee and Hambantota, are valuable to any power seeking influence or security in the region. For India, a friendly and stable Sri Lanka protects its southern maritime flank; for Sri Lanka, India is its largest neighbour, a vast market and a natural partner in times of difficulty.

This closeness has a downside as well. Because the distance is small, what happens on one shore quickly affects the other, whether it is refugee movement, fishing activity, political sentiment in Tamil Nadu or the movements of foreign vessels.

Colonial Era, Independence and the Indian-Origin Tamils

Both countries came under British rule, and both gained independence within a year of each other, India in 1947 and Ceylon in 1948. The early years were marked by cordial relations, shared membership of the Commonwealth and a common commitment to non-alignment, though Sri Lanka at times followed a more cautious foreign policy.

A major legacy of the colonial period is the community of Indian-origin Tamils, often called hill-country or plantation Tamils. During the 19th century the British brought large numbers of workers from southern India to labour on tea, coffee and rubber estates in the central highlands. Many were left stateless after Ceylon’s independence because of citizenship laws passed in the late 1940s and early 1950s.

The 1964 and 1974 agreements

The status of this population was a central bilateral issue for decades. The Sirimavo-Shastri Pact of 1964 provided for the repatriation of a large number of people to India and the grant of Sri Lankan citizenship to others, and a follow-up agreement was concluded in 1974. Over time most of those remaining acquired citizenship, and the community is now an important part of Sri Lanka’s society, with its own political representation and a continuing need for better housing, education and wages.

The same year, 1974, saw an agreement on the maritime boundary in the Palk Strait, which is discussed in the section on fishermen below.

The Tamil Question and the Civil War

Tensions between the Sinhalese majority and the Tamil minority built up after independence, driven by disputes over language policy, education, employment and representation. Violence against Tamils, including the large-scale riots of July 1983, hardened attitudes and pushed some Tamil groups towards armed struggle. Several militant organisations emerged, of which the Liberation Tigers of Tamil Eelam (LTTE) eventually became the most powerful.

India was drawn in by a combination of humanitarian concern, domestic politics and regional strategy. Tamil Nadu, with its cultural and linguistic proximity to Sri Lankan Tamils, felt the conflict acutely, and thousands of refugees crossed the strait to Indian shores. In the early 1980s, India offered shelter and, according to widely documented accounts, allowed some Tamil militant groups to operate from its territory. The government also sought to mediate between Colombo and Tamil representatives.

India’s consistent position

• India has supported the unity and territorial integrity of Sri Lanka.
• It has opposed a separate Tamil state and, after the late 1980s, treated the LTTE as a terrorist organisation.
• It has asked for a political settlement that respects the equality, dignity and aspirations of Tamils within a united Sri Lanka.

The armed conflict continued, with intervals of talks, until May 2009, when the Sri Lankan military declared the LTTE defeated. The war left a heavy human toll, large numbers of displaced people and unresolved questions about reconciliation, accountability and power-sharing.

The 1987 Accord, the IPKF and the 13th Amendment

The most dramatic chapter in India-Sri Lanka relations came in 1987. In June of that year, India air-dropped relief supplies over the besieged Jaffna peninsula, a move seen as a strong signal to Colombo. A month later, on 29 July 1987, Prime Minister Rajiv Gandhi and President J. R. Jayewardene signed the India-Sri Lanka Accord. It promised devolution of power to provincial councils, a merger (temporary and subject to a referendum) of the Northern and Eastern provinces, recognition of Tamil as an official language, and the disarming of militant groups. India agreed to help enforce the arrangement.

The Indian Peace Keeping Force

To implement the Accord, the Indian Peace Keeping Force (IPKF) was sent to the north and east of Sri Lanka. What began as a peacekeeping mission soon turned into a military confrontation with the LTTE, which rejected the arrangement. The operation was costly, with a considerable number of Indian soldiers killed, and it was politically unpopular in both countries. The IPKF withdrew fully by March 1990 after the Sri Lankan government asked for its departure.

A painful legacy

The intervention left deep scars. On 21 May 1991, Rajiv Gandhi was assassinated by a suicide bomber at Sriperumbudur in Tamil Nadu, in an attack attributed to the LTTE. Afterwards, India became far more cautious about direct involvement in Sri Lanka’s internal affairs.

The 13th Amendment

The Accord’s one lasting institutional outcome was the 13th Amendment to Sri Lanka’s Constitution, adopted in 1987. It created provincial councils and set out a framework for devolving certain powers. Its full implementation, particularly concerning land and police powers, has remained a long-standing subject of discussion, and India has repeatedly encouraged Sri Lanka to carry the process forward.

Trade, Investment and the Free Trade Agreement

Economic exchange has grown steadily since the 1990s. The India-Sri Lanka Free Trade Agreement, signed in December 1998 and operational from March 2000, was India’s first such agreement with a South Asian neighbour. It reduced or removed tariffs on a wide range of goods and encouraged trade in both directions. Trade between the two countries has expanded considerably since then, and India has remained one of Sri Lanka’s leading trading partners and sources of imports.

What is traded

• India exports petroleum products, vehicles, pharmaceuticals, textiles, machinery, cereals and sugar.
• Sri Lanka sends tea, rubber products, apparel, spices and certain industrial goods.
• Services such as tourism, education, health care and information technology also form a growing part of the exchange.

Investment

Indian companies have invested in sectors such as telecommunications, banking, cement, hospitality, automobiles, petroleum retail and real estate. Indian firms were among the early foreign investors to return to Sri Lanka after the war ended. A recurring theme in discussions has been the idea of a more comprehensive economic partnership, covering services, technology and investment, to build on the original trade agreement.

Sri Lanka has also asked for greater market access for its products and for better balance in trade, concerns that are common in relations between a large economy and a smaller neighbour.

Development Cooperation: Housing, Railways and Energy

India’s development partnership with Sri Lanka has focused on projects that have a direct impact on people’s lives, particularly in the north and east, the regions most affected by the war.

• Housing: One of the best-known efforts is the Indian Housing Project, under which tens of thousands of houses were built for war-affected and displaced families in the north and east, and later extended to plantation communities in the central highlands.
• Railways: India supported the rebuilding of the Northern railway line towards Jaffna, damaged during the conflict, and supplied rolling stock and signalling upgrades.
• Health: An emergency ambulance service, widely known as Suwa Seriya, was launched with Indian grant assistance and has served communities across the island.
• Culture and education: India helped build the Jaffna Cultural Centre, supported restoration of religious and heritage sites, and offers scholarships to Sri Lankan students each year.
• Energy and ports: Cooperation has included work around Trincomalee, which has a large natural harbour and a historic oil tank farm, and proposals for joint energy projects.

Development assistance is delivered through a mix of grants and concessional lines of credit. It is meant to be demand-driven, with Sri Lanka selecting projects, which both governments say fits the principle of mutual benefit rather than strategic competition.

The 2022 Economic Crisis and India’s Assistance

In 2022, Sri Lanka faced its worst economic crisis since independence. A severe shortage of foreign exchange led to a sovereign debt default, long queues for fuel and cooking gas, power cuts, shortages of essential medicines and steep inflation. Tourism, remittances and export earnings had been hit by earlier shocks, and the country’s external debt had grown heavy.

India responded quickly and at a scale that stood out. Over a short period it extended assistance of around US$4 billion, delivered through several channels:

• Credit lines and credit-linked arrangements for the purchase of fuel and food.
• Currency swap and deferred-payment support to ease pressure on Sri Lanka’s reserves.
• Shipments of rice, medicines and other essentials.
• Support for Sri Lanka’s negotiations with the International Monetary Fund, including the financing assurances the IMF required before approving a programme.

Many Sri Lankans acknowledged this help publicly, and the episode strengthened the idea of India as a “first responder” in the neighbourhood. It also became a reference point in the broader debate on how regional powers can support smaller economies in distress. The recovery that followed has depended on reforms, debt restructuring and renewed growth, and India has continued to be a significant partner in that process.

The Fishermen Issue and Katchatheevu

Few issues touch ordinary lives as directly as fishing in the Palk Strait. The waters between Tamil Nadu and northern Sri Lanka are narrow and rich in marine life, and the International Maritime Boundary Line (IMBL) runs through them. Fishermen from Tamil Nadu have long fished in these waters, and Sri Lankan fishermen in the north, whose livelihoods were disrupted by the war, have objected to what they describe as encroachment and damaging fishing methods such as bottom trawling.

Sri Lanka’s navy regularly arrests Indian fishermen found across the boundary line and impounds their boats. Such incidents are followed by diplomatic exchanges, humanitarian releases and calls for a lasting solution. Both governments have set up mechanisms for dialogue, including meetings of fisheries ministers and joint working groups, and have discussed alternatives such as deep-sea fishing, to reduce pressure on the strait.

The Katchatheevu question

Katchatheevu is a small uninhabited islet in the Palk Strait, lying between Rameswaram and Delft island. Under the maritime boundary agreements of 1974 and 1976, India recognised Sri Lankan sovereignty over it, and the 1976 agreement also addressed fishing rights in each other’s waters. The question of whether Indian fishermen retain traditional rights near the islet has been raised repeatedly in Tamil Nadu, while Sri Lanka maintains that the agreements settled the matter. The issue remains a sensitive subject of political debate in India and an item in bilateral talks.

The China Factor in India-Sri Lanka Relations

Since the end of the civil war, Chinese loans and construction contracts have transformed parts of Sri Lanka’s infrastructure, including highways, a container terminal in Colombo, an international airport and a deepwater port at Hambantota. These projects offered Sri Lanka new facilities at a time when other lenders were cautious, but they also added to the country’s debt burden.

Hambantota

The Hambantota port, on the southern coast near major shipping routes, struggled to generate enough revenue. In 2017 the government agreed to hand a majority stake and a 99-year lease to a Chinese state-owned company, China Merchants Port Holdings, in exchange for investment that eased its debt obligations. The arrangement is frequently cited internationally in discussions about debt and strategic assets, even though analysts debate how much of Sri Lanka’s total debt was owed to Chinese lenders.

Security concerns

India has voiced concern about the possibility of Chinese military or dual-use access close to its southern coast. In 2014, a Chinese submarine docking at Colombo drew objections from New Delhi. In August 2022, the arrival of a Chinese research and tracking vessel at Hambantota raised fresh concerns, since such ships can gather data relevant to naval and missile activity. Sri Lanka has stated that it follows an independent, non-aligned policy and that its territory will not be used against any neighbour’s security interests. Since then, it has adopted more formal procedures for foreign research vessel visits.

Sri Lanka’s position can be summarised as a balancing act. It needs capital and markets from several partners, and it values its relationship with India as much as its economic engagement with China.

Connectivity, Security Cooperation and People-to-People Ties

Recent decades have seen a push to physically connect the two countries and to strengthen cooperation in defence and security.

Connectivity

• Air links: Direct flights connect Colombo with several Indian cities, and Jaffna’s Palaly airport has been developed for flights from India. Flights to Kushinagar, the Buddhist pilgrimage site in Uttar Pradesh, have been promoted for Sri Lankan pilgrims.
• Sea links: Passenger ferry services between Tamil Nadu and northern Sri Lanka, once suspended for decades, have been revived on routes such as Nagapattinam to Kankesanthurai.
• Energy and digital links: Proposals for an electricity grid interconnection, a possible petroleum pipeline and wider adoption of Indian digital payment systems have been discussed as long-term projects.

Security cooperation

The two countries conduct joint military exercises, including naval exercises, and India offers training slots for Sri Lankan military personnel. India has also gifted maritime surveillance assets to Sri Lanka. Both are members, along with the Maldives and Mauritius, of the Colombo Security Conclave, a forum for cooperation on maritime security, terrorism, trafficking and cyber threats.

Key milestones at a glance

Conclusion

India-Sri Lanka relations show how history, geography and politics can combine to create a relationship that is both intimate and sensitive. A shared Buddhist and Hindu heritage, a common colonial past and a short sea crossing provide a foundation that few partnerships can match. At the same time, the legacy of the IPKF, the unfinished business of Tamil reconciliation, the fishermen dispute and the competition for influence in the Indian Ocean mean that mutual trust must be constantly renewed.

The strongest elements of the partnership are practical: trade, development projects, connectivity, security cooperation and the human links of families, pilgrims and students. If both countries continue to treat each other as equal partners with distinct interests, these elements are likely to carry the relationship forward, whatever disagreements arise along the way. Page last updated: 1 October 2026.

Frequently Asked Questions

How old are India-Sri Lanka relations?

The links go back more than two thousand years. The most famous episode is the 3rd century BCE mission of Mahinda and Sanghamitta, the children of Emperor Ashoka, who brought Buddhism to Sri Lanka. Trade, migration and cultural exchange, especially with southern India, have continued ever since.

What was the India-Sri Lanka Accord of 1987?

It was an agreement signed on 29 July 1987 by Rajiv Gandhi and J. R. Jayewardene to address the Tamil question. It provided for devolution through provincial councils, a link between the Northern and Eastern provinces, Tamil as an official language and the disarming of militant groups. It also led to the deployment of the Indian Peace Keeping Force and to Sri Lanka’s 13th Amendment.

Why did the IPKF go to Sri Lanka and why did it leave?

The IPKF was sent in 1987 to help implement the Accord and oversee the disarming of militants. It became involved in fighting with the LTTE, which rejected the arrangement, and the mission was widely criticised. It withdrew completely by March 1990 at the request of the Sri Lankan government.

What is the Katchatheevu issue?

Katchatheevu is a small uninhabited islet in the Palk Strait. Under agreements in 1974 and 1976, India recognised it as part of Sri Lanka. The matter is raised periodically in Tamil Nadu, mainly because of concerns over the fishing rights of Indian fishermen in the surrounding waters.

How did India help Sri Lanka during the 2022 economic crisis?

India provided assistance of around US$4 billion through credit lines, currency support, fuel, food and medicines, and also supported Sri Lanka’s efforts to obtain IMF assistance. This was one of the largest and quickest responses from any country at the time.

Why is China’s role in Sri Lanka a concern for India?

Chinese investment, including the 99-year lease of the Hambantota port, and visits by Chinese research and naval vessels have raised worries in India about possible strategic use of facilities close to its coast. Sri Lanka says it follows an independent foreign policy and will not allow its territory to be used against the security interests of any country, including India.

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