Re: India has rights of an elder brother, says Lanka.
that is why i said, india should mediate when both parties themselves are asking for it. There are no two ways about it.
either you sell arms to sri lanka or allow them to get it from others. irrespective of sri lanka getting it from india or not, they would certainly go ahead and get it from others. Or you mediate. Choice can only be one.
One more option could be, If indian government fears increased influence of others in sri lanka, then help sri lankans economically(which already it is doing) and continue to supply small or so called defensive weapons. But this cannot be for long term.
Actually, long term solution cannot also be war in turn for that buying weapons from outside.