India–Sri Lanka relations
Bilateral relations between the Democratic Socialist Republic of Sri Lanka and the Republic of India have been generally friendly, but were controversially affected by the Sri Lankan civil war and by the failure of Indian intervention during the war. India is the only neighbour of Sri Lanka, separated by the Palk Strait; both nations occupy a strategic position in South Asia and have sought to build a common security umbrella in the Indian Ocean. Historically and culturally, the two nations have been considerably close, with 70% of Sri Lankans continuing to follow Theravada Buddhism to this day.
In recent years Sri Lanka has moved closer to China, especially in terms of naval agreements. India has signed the nuclear energy deal to improve relationships.
According to traditional Sri Lankan chronicles (such as the Dipavamsa), Buddhism was introduced into Sri Lanka in the 4th century BCE by Venerable Mahinda, the son of Indian Emperor Ashoka, during the reign of Sri Lanka's King Devanampiya Tissa. During this time, a sapling of the Bodhi Tree was brought to Sri Lanka and the first monasteries and Buddhist monuments were established. Among these, the Isurumuni-vihaara and the Vessagiri-vihaara remain important centers of worship. He is also credited with the construction of the Pathamaka-cetiya, the Jambukola-vihaara and the Hatthaalhaka-vihaara, and the refectory. The Pali Canon, having previously been preserved as an oral tradition, was first committed to writing in Sri Lanka around 30 BCE.
Sri Lanka has the longest continuous history of Buddhism of any Buddhist nation, with the Sangha having existed in a largely unbroken lineage since its introduction in the 4th century. During periods of decline, the Sri Lankan monastic lineage was revived through contact with Myanmar and Thailand. Periods of Mahayana influence, as well as official neglect under colonial rule, created great challenges for Theravada Buddhist institutions in Sri Lanka, but repeated revivals and resurgences - most recently in the 19th century CE - have kept the Theravada tradition alive for over 2,600 years.
Indian intervention in the Sri Lankan civil war
In the 1970s–1980s, private entities and elements in the Research and Analysis Wing and the state government of Tamil Nadu were believed to be encouraging the funding and training for the Liberation Tigers of Tamil Eelam, a separatist insurgent force. In 1987, faced with growing anger amongst its own Tamils, and a flood of refugees,  India intervened directly in the conflict for the first time after the Sri Lankan government attempted to regain control of the northern Jaffna region by means of an economic blockade and military assaults, India supplied food and medicine by air and sea. After subsequent negotiations, India and Sri Lanka entered into an agreement/13th amendment. The peace accord assigned a certain degree of regional autonomy in the Tamil areas with Eelam People's Revolutionary Liberation Front (EPRLF) controlling the regional council and called for the Tamil militant groups to lay down their arms. Further India was to send a peacekeeping force, named the IPKF to Sri Lanka to enforce the disarmament and to watch over the regional council.
Even though the accord was signed between the governments of Sri Lanka and India, with the Tamil Tigers and other Tamil militant groups not having a role in the signing of the accord, most Tamil militant groups accepted this agreement, the LTTE rejected the accord because they opposed the candidate, who belonged to another militant group named Eelam Peoples Revolutionary Liberation Front (EPRLF), for chief administrative officer of the merged Northern and Eastern provinces. Instead the LTTE named three other candidates for the position. The candidates proposed by the LTTE were rejected by India. The LTTE subsequently refused to hand over their weapons to the IPKF.
The result was that the LTTE now found itself engaged in military conflict with the Indian Army, and launched their first attack on an Indian army rations truck on October 8, killing five Indian para-commandos who were on board by strapping burning tires around their necks. The government of India then decided that the IPKF should disarm the LTTE by force, and the Indian Army launched number of assaults on the LTTE, including a month-long campaign dubbed Operation Pawan to win control of the Jaffna peninsula from the LTTE. When the IPKF engaged the LTTE, the then president of Sri Lanka, Ranasinghe Premadasa, began supporting LTTE and funded LTTE with arms. During the warfare with the LTTE, IPKF was also alleged to have made human rights violation against the civilians. Notably, IPKF was alleged to have perpetrated Jaffna teaching hospital massacre which was the killing of over 70 civilians including patients, doctors and nurses. The ruthlessness of this campaign, and the Indian army's subsequent anti-LTTE operations made it extremely unpopular amongst many Tamils in Sri Lanka. The conflict between the LTTE and the Indian Army left over 1,000 Indian soldiers dead.
The Indo-Sri Lankan Accord, which had been unpopular amongst Sri Lankans for giving India a major influence, now became a source of nationalist anger and resentment as the IPKF was drawn fully into the conflict. Sri Lankans protested the presence of the IPKF, and the newly elected Sri Lankan president Ranasinghe Premadasa demanded its withdrawal, which was completed by March 1990. on May 21, 1991, Rajiv Gandhi was assassinated and the LTTE was alleged to be the perpetrator. As a result India declared the LTTE to be a terrorist outfit in 1992. Bilateral relations improved in the 1990s and India supported the peace process but has resisted calls to get involved again. India has also been wary of and criticised the extensive military involvement of Pakistan in the conflict, accusing the latter of supplying lethal weaponry and encouraging Sri Lanka to pursue military action rather than peaceful negotiations to end the civil war.
India and Sri Lanka are member nations of several regional and multilateral organisations such as the South Asian Association for Regional Cooperation (SAARC), South Asia Co-operative Environment Programme, South Asian Economic Union and BIMSTEC, working to enhance cultural and commercial ties. Since a bilateral free trade agreement was signed and came into effect in 2000, Indo-Sri Lankan trade rose 128% by 2004 and quadrupled by 2006, reaching USD 2.6 billion. Between 2000 and 2004, India's exports to Sri Lanka in the last four years increased by 113%, from USD 618 million to $1,319 million while Sri Lankan exports to India increased by 342%, from $44 million to USD $194 million. Indian exports account for 14% of Sri Lanka’s global imports. India is also the fifth largest export destination for Sri Lankan goods, accounting for 3.6% of its exports. Both nations are also signatories of the South Asia Free Trade Agreement (SAFTA). Negotiations are also underway to expand the free trade agreement to forge stronger commercial relations and increase corporate investment and ventures in various industries. The year 2010 is predicted to be the best year for bilateral trade on record, with Sri Lanka's exports to India increasing by 45% over the first seven months of the year
India's National Thermal Power Corp (NTPC) is also scheduled to build a 500 MW thermal power plant in Sampoor (Sampur). The NTPC claims that this plan will take the Indo-Sri Lankan relationship to new level.
There have been several alleged incidents of Sri Lankan Navy personnel firing on Indian fishermen fishing in the Palk Strait, where India and Sri Lanka are only separated by 12 nautical miles.The issue is because of Indian fishermen using mechanised trawlers which deprives the Sri Lankan fishermen including Tamils of their catch and also damaging their fishing boats. The Sri Lankan government wants India to ban use of mechanized trawlers in the palk strait region and the negotiations on the same are going on. So far no concrete agreement has been reached since India favors regulating these trawlers instead of banning them altogether. Anger amongst the Sri Lankan side is also because the use of mechanized trawlers is ecologically damaging.  Indian Government has always taken up the issue of safety of Indian fishermen on a priority basis with the Government of Sri Lanka. Presently there is no bonafide Indian fisherman in the Sri Lankan custody. A Joint Working Group (JWG) has been constituted to deal with the issues related to Indian fishermen straying in Sri Lankan territorial waters, work out modalities for prevention of use of force against them and the early release of confiscated boats and explore possibilities of working towards bilateral arrangements for licensed fishing. The JWG last met in Jan 2006. India officially protested against Sri Lanka Navy for its alleged involvement in attacks on Indian fishermen on January 12, 2011. Even after the official protest, another fisherman was killed in a brutal manner on Jan 22, 2011. Over 530 fishermen have been killed in the last 30 years. The apathetic attitude of the Indian government and the national media towards the alleged killing of Tamil Nadu fishermen by the Sri Lankan Navy is being strongly condemned. Several Tamil Nadu politicians like Vaiko and Jayalalitha have condemned the federal government for not doing enough to stop the killing of Indian Tamil fishermen, and for offering training, equipment, and strategic cooperation for the Sri Lankan Navy. In November 2014, Sri Lanka ordered capital punishment to Indian fishermen who were allegedly involved in drug supply or other kind of smuggling. Activists from India approached to Sri Lankan government through an appeal, where they stated the need to stregthen south asian regional cooperation for all such issues. It was appealed that though crime of any kind must get punishment, but capital punishment must be revoked in this case and in general from all over south asia. Prime Minister of Sri Lanka Ranil Winckramsinghe during an interview to a television channel in March 2015 told 'if Indian fishermen will cross the sea boundary, Sri lankan navy can shoot them.' This remark sparked controversy over Sri Lanka - India relation. Externeal affairs minister of India raised the issue with meeting her counterpart in Sri Lanka, but the statement of PM of Sri Lanka was condemned by civil rights activists, even open letters were written to PMs of Sri Lanka and India to resolve the dispute and to apologize for statements as fishermen are not criminals. 
India is active in a number of areas of development activity in Sri Lanka. About one-sixth of the total development credit granted by GOI is made available to Sri Lanka.
Lines of credit: In the recent past three lines of credit were extended to Sri Lanka: US$ 100 million for capital goods, consumer durables, consultancy services and food items, US$ 31 million for supply of 300,000 MT of wheat and US$ 150 million for purchase of petroleum products. All of these lines of credit have been fully utilized. Another line of credit of US$ 100 million is now being made available for rehabilitation of the Colombo-Matara railway.
A number of development projects are implemented under ‘Aid to Sri Lanka’ funds. In 2006-07, the budget for ‘Aid to Sri Lanka’ was Rs 28.2 Crs.
Small Development Projects: A MoU on Cooperation in Small Development Projects has been signed. Projects for providing fishing equipment to the fishermen in the East of Sri Lanka and solar energy aided computer education in 25 rural schools in Eastern Sri Lanka are under consideration.
Health Projects: India have supplied medical equipment to hospitals at Hambantota and Point Pedro, supplied 4 state of the art ambulances to the Central Province, implemented a cataract eye surgery programme for 1500 people in the Central Province and implemented a project of renovation of OT at Dickoya hospital and supplying equipment to it.
The projects under consideration are: Construction of a 150-bed hospital at Dickoya, upgradation of the hospital at Trincomalee and a US$ 7.5 million grant for setting up a Cancer Hospital in Colombo.
Education Projects: Upgradation of the educational infrastructure of the schools in the Central province including teachers’ training, setting up of 10 computer labs, setting up of 20 e-libraries (Nenasalas), Mahatma Gandhi scholarship scheme for +2 students and setting up of a vocational training centre in Puttalam. India also contributes to the Ceylon Workers Education Trust that gives scholarships to the children of estate workers.
Training: A training programme for 465 Sri Lankan Police officers has been commenced in Dec 2005. Another 400 Sri Lankan Police personnel are being trained for the course of ‘Maintenance of Public Order’.
Indian governments have also showed interest in collaborating with their Sri Lankan counterparts on building tourism between the two countries based on shared religious heritage. Madhya Pradesh CM Shivraj Chauhan in June 2013 stated he was working with Sri Lankan authorities to build a temple dedicated to the Hindu queen Sita in Nuwara Eliya
Other areas of Cooperation
India and Sri Lanka signed an agreement allowing for the transfer of criminals serving prison sentences in the other country to be repatriated to serve the balance of their sentences in their home country. Sentenced persons from Kerala and Tamil Nadu have been transferred under the agreement from Sri Lanka to India. There are areas of cooperation where people to people contacts are focused. Sri Lanka and India has friendly relations through people's support also. It was seen that A. T. Ariyaratne in Sri Lanka helped in spreading non violence and community service activities on Gandhian philosophy.
The China issue
In recent years Sri Lanka has moved closer to China, especially in terms of naval agreements. India and Sri Lanka in February 2015 signed a nuclear energy deal to improve relationships. Recently elected Indian Prime Minister Narendra Modi in a meeting with recently elected Sri Lankan president Maithripala Sirisena stated that: "India is Sri Lanka's closest neighbor and friend. Our destinies are interlinked."
- Sri Lankans in India
- Indians in Sri Lanka
- List of Indians in Sri Lanka
- Indian Tamils of Sri Lanka
- Deputy High Commission of Sri Lanka, Chennai
- Foreign relations of Sri Lanka
- Foreign relations of India
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