what was india's foreign policy regarding this issue?
India vowed never to offer any military help to Sri Lanka.
Indian Peace Keeping Force
 India vowed never to offer any military help to Sri Lanka again. This policy has not been changed since and no defence pact has been signed between India and Sri Lanka. India has never been directly involved in the peace talks between the LTTE and Sri Lanka but has supported Norway's efforts.
how many tamils are there in sri lanka 70% since how long have they been living here? Sri Lankan Tamils have a very long history in Sri Lanka and have lived on the island since at least around the 2nd century BCE. are they genetically linked to other sri lankans? Yes,  genetic studies indicate that they are closely related to the Sinhalese ethnic group in the island. which religion do they follow? The Sri Lankan Tamils are mostly Hindus with a significant Christian population. was there any militancy related to them? Yes, Liberation Tigers of Tamil Eelam (LTTE) what was its goal? Its aim was to secure an independent state of Tamil Eelam were they declared as a terrorist organization? Yes, 32 countries currently list the LTTE as a terrorist organisation. did they carry out any suicide attacks? Yes, their mission included carrying out suicide attacks against enemy targets. did the assassinate anyone? Yes, Ranasinghe Premadasa, Rajiv Gandhi who was the first person mentioned? Sri Lankan president was he impeached? Yes, He  faced an impeachment in parliament led by his two formidable rivals in the UNP, Lalith Athulathmudali and Gamini Dissanayake. when was he assassinated? May 1, Saturday, 1993. why was the second person mentioned above assassinated? Gandhi was killed because of personal animosity by the LTTE chief Prabhakaran arising from his sending the Indian Peace Keeping Force (IPKF) to Sri Lanka and the alleged IPKF atrocities against Sri Lankan Tamils. why was the force sent there? UNANSWERABLE did the force consist of only indian army? It was formed under the mandate of the 1987 Indo-Sri Lankan Accord that aimed to end the Sri Lankan Civil War between Sri Lankan Tamil nationalists such as the Liberation Tigers of Tamil Eelam (LTTE) and the Sri Lankan military.
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Indian Peace Keeping Force [SEP] India's foreign policy
The debacle that was IPKF's intervention in Sri Lanka is raised at times in Indian political discourse whenever the situation in Sri Lanka shows signs of deteriorating, and there is a question of intervening; or, in Sri Lankan politics (particularly by the LTTE), when it is proposed that India, or, more broadly, other foreigners, ought to have a role in promoting peace on the island nation. As a result, relations between India and Sri Lanka became extremely sour and India vowed never to offer any military help to Sri Lanka again. This policy has not been changed since and no defence pact has been signed between India and Sri Lanka.