"The decision to deploy the IPKF in Sri Lanka was a high-level policy failure," the former Army chief said at an event to discuss his autobiography titled 'Courage and Conviction' here.
"It was a policy failure that the Government of India and Sri Lanka had entered into an agreement, while the fight was between Liberation Tigers of Tamil Eelam (LTTE) and the Sri Lankan government. Neither there was control over the LTTE nor did they owe any responsibility," he said.
The Union Minister claimed that during IPKF operations in Sri Lanka, Indian forces got several opportunities to nab LTTE supremo Velupillai Prabhakaran but every time there were "instructions", which ensured him a safe passage.
Singh also claimed that at one point, none other than late Sri Lankan president Ranasinghe Premadasa had sought to help the LTTE fight the IPKF.
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On improving ties between India and Pakistan, Singh said an initiative has been taken with the neighbouring nation, which has been asked to ensure a good atmosphere there.
He said that China has settled border issues with all its neighbouring countries, but not with India.
"Trouble erupted since the day China started calling Arunachal as 'South Tibet'. China has settled its border disputes with all neighbouring countries, but not with India. The issue needs to be resolved. However, we can't fix a time frame for that," he said.