Indo-Pak Pact On Landmines?

Both, India and Pakistan have adhered to the 1980 Convention on Certain Conventional Weapons, which may be deemed to be excessively injurious or to have indiscriminate effects. But neither has signed the Anti-Personnel Mine Ban Convention adopted in 1997. Why not make ratification and enforcement of this Convention part of the confidence building measures currently being discussed in Indo-Pak talks?