Sri Lanka, from the early 1980s, was facing increasingly violent ethnic strife in the Sri Lankan Civil War. The origins of the Sri Lankan Civil War can be traced to the independence of Sri Lanka in 1948, after the end of British rule. At the time, a Sinhalese majority government was instituted. This government, which included the Tamil Congress, passed legislation deemed discriminatory by some against the native Tamil minority in Sri Lanka.
In the 1970s, two major Tamil parties, the Tamil Congress and a split, the Federal Party united to form the Tamil United Liberation Front (TULF), a separatist Tamil nationalist group that agitated for a separate state of Tamil Eelam in north and eastern Sri Lanka that would grant the Tamils greater autonomy within the federal structure.
However, the Sixth Amendment to the Constitution of Sri Lanka, enacted in August 1983, classified all separatist movements as unconstitutional, Outside the TULF, Tamil factions advocating more militant courses of action soon emerged, and the ethnic divisions eventually led to violent civil war.
Indian involvement and intervention
Initially, under Indira Gandhi and later under Rajiv Gandhi, the Indian Government sympathised with the Tamil insurrection in Sri Lanka because of the strong support for the Tamil cause within the Indian state of Tamil Nadu. Emboldened by this support, supporters in Tamil Nadu provided a sanctuary for the separatists and helped the LTTE smuggle arms and ammunition into Sri Lanka, making them the strongest force on the island. In fact in 1982, the LTTE supremo Prabhakran was arrested by the police in Tamil Nadu, for a shoot-out with his rival Uma Maheswaran, in the middle of the city. Both of them were arrested and later released by the police. This activity was left unchecked as India's regional and domestic interests wanted to limit foreign intervention on what was deemed as an ethnic issue between the Tamils and the Sinhalese. To this end, the Indira Gandhi government sought to make it clear to Sri Lankan president Junius Richard Jayewardene that armed intervention in support of the Tamil movement was an option India would consider if diplomatic solutions should fail.
The first round of civil violence flared in 1983 when the killing of 13 soldiers of the Sri Lanka Army sparked anti-Tamil pogroms—the Black July riots—in which approximately 400 Tamils were killed. The riots only aided in the deterioration of the ethnic relations. Militant factions, including the LTTE, at this time recruited in large numbers and continued building on popular Tamil dissent and stepped up the guerrilla war. By May 1985, the guerrillas were strong enough to launch an attack on Anuradhapura, attacking the Bodhi Tree shrine–a sacred site for Buddhist Sinhalese–followed by a rampage through the town. At least 150 civilians died in the hour-long attack.
Gandhi's government attempted to re-establish friendly relations with the various factions in Sri Lanka while maintaining diplomatic efforts to find a solution to the conflict as well as limiting overt aid to the Tamil fighters.
The Sri Lankan government, deducing a decline in support for the Tamil rebels from India, tried to rearming itself extensively for its anti-insurgent role with support from Pakistan, Israel, Singapore, and South Africa. In 1986, the campaign against the insurgency was stepped up. In 1987, retaliating against an increasingly bloody insurgent movement, the Vadamarachchi Operation (Operation Liberation) was launched against LTTE strongholds in Jaffna Peninsula. The operation involved nearly 4,000 troops, supported by helicopter gunships as well as ground-attack aircraft. In June 1987, the Sri Lankan Army laid siege on the town of Jaffna. This resulted in large-scale civilian casualties and created a condition of humanitarian crisis. India, which had a substantial Tamil population in South India faced the prospect of a Tamil backlash at home, called on the Sri Lankan government to halt the offensive in an attempt to negotiate a political settlement. However, the Indian efforts were unheeded. Added to this, in the growing involvement of Pakistani advisers, it was necessary for Indian interest to mount a show of force. Failing to negotiate an end to the crisis with Sri Lanka, India announced on 2 June 1987 that it wound send a convoy of unarmed ships to northern Sri Lanka to provide humanitarian assistance but this was intercepted by the Sri Lankan Navy and forced to turned back.
Following the failure of the naval mission the decision was made by the Indian government to mount an airdrop of relief supplies in aid of the beleaguered civilians over the besieged city of Jaffna. On 4 June 1987, in a bid to provide relief, the Indian Air Force mounted Operation Poomalai. Five Antonov An-32s under fighter cover flew over Jaffna to airdrop 25 tons of supplies, all the time keeping well within the range of Sri Lankan radar coverage. At the same time the Sri Lankan Ambassador to New Delhi, Bernard Tilakaratna, was summoned to the Foreign Office to be informed by the Minister of State, External Affairs, K. Natwar Singh, of the ongoing operation and also indicated that the operation was expected not to be hindered by the Sri Lankan Air Force. The ultimate aim of the operation was both to demonstrate the seriousness of the domestic Tamil concern for the civilian Tamil population and reaffirming the Indian option of active intervention to the Sri Lankan government.
Indo-Sri Lanka Accord
Following Operation Poomalai, faced with the possibility of an active Indian intervention and lacking any possible ally, the President, J. R. Jayewardene, offered to hold talks with the Rajiv Gandhi government on future moves. The siege of Jaffna was soon lifted, followed by a round of negotiations that led to the signing of the Indo-Sri Lankan Accord on 29 July 1987 that brought a temporary truce. Crucially however, the negotiations did not include the LTTE as a party to the talks.
The signing of the Indo-Sri Lankan Accord on 29 July 1987 brought a temporary truce to the Sri Lankan Civil War. Under the terms of the agreement,
Colombo agreed to a devolution of power to the provinces, the Sri Lankan troops were withdrawn to their barracks in the north, the Tamil rebels were to disarm.