Why should India sign the NPT? Signing it would force India to forswear its nuclear option. Acceding to NPT means accepting the three basic principles represented by it:
> Non-proliferation
> Disarmament
> The right to only peaceful usees of nuclear technology.
Therefore, can a country, placed as India is, with a 'hostile' neighborhood sign the NPT, more so when the very foundations of the treaty are being shaken thoroughly?
Two main objections are:
> NPT creates a club of "nuclear haves" and a larger group of "nuclear have-nots" by restricting the legal possession of nuclear weapons to those states that tested them before 1967. But the treaty never explains on what ethical grounds such a distinction is valid.
> More importantly, while China is recognized as a nuclear have, India cannot remain a nuclear have not!!
So, Japan asking India to sign the NPT doesn't stand to reason.