Sorry mate, but that is such a narrow view of your own history. The Tamil diaspora are the ones that would have sought secession which included India. I can not believe you do not know that and here you are debating this with me.
Lets take your point as is, that is quite a remarkable military feat...dont you think? I mean, you are inherently acknowledging that such a large force of the IPKF which also included the indian air force were completely useless against the LTTE but Pakistan's training to SL and a single MBRL stopped the LTTE? You have such a flawed understanding of what kind of assistance Pakistan provided to SL and I can not be bothered to educate you on this.
Anyway, I can see first hand how limited your knowledge is on the matter. Come back to debate once you read this part of your history from more impartial sources.