New Delhi, Aug 22 - India played a critical, albeit covert, role in the success of Sri Lanka's war against the Tamil Tigers, with the Indian Navy providing vital intelligence in locating and destroying at least a dozen LTTE rogue vessels laden with arms, says the first such detailed account of the operation.

India's covert support to Sri Lanka in the war against the LTTE assumed many forms, ranging from back-channel talks and a tacit endorsement of Colombo's destroy-LTTE mission to supply of military hardware and sharing of real-time intelligence, says Nitin A. Gokhale in his book 'Sri Lanka - From War to Peace' (Har-Anand Publications).

New Delhi helped Colombo in myriad ways despite its public hands-off posture and denial of offensive weapons to the Liberation Tigers of Tamil Eeelam (LTTE) due to domestic political compulsions, contends Gokhale.

The ruling United Progressive Alliance (UPA) government in New Delhi was dependent upon the DMK party from Tamil Nadu, perceived to be sympathetic to the LTTE, for its survival in parliament.

'Publicly, India maintained that it would not give Sri Lanka any offensive weapons. Yet, in early 2006 India quietly gifted five Mi-17 helicopters to the Sri Lankan Air Force,' Gokhale writes. 'The only Indian condition was: these helicopters would fly under Sri Lankan Air Force colours. New Delhi clearly did not want to annoy UPA's Tamil Nadu allies like the DMK unnecessarily,' he says.

The author singles out the Indian Navy for special praise. The Indian Coast Guard gifted a Sukanya Class offshore patrol vessel (OPV) to the Sri Lankan Navy in 2002, which played a major role in several daring missions launched by the Sri Lankan Air Force to rescue the Army's Deep Penetration Units when they were surrounded by LTTE's counter-infiltration units.