India’s objection to the CTBT have been on five grounds. It does not link itself to the total nuclear disarmament in the time bound manner.
CTBT is not comprehensive in the true sense of the term since it allows sub critical tests and computer simulations of tests.
The treaty does not take into account India’s security consideration.
CTBTs verification systems does not provide a genuinely impartial international mechanism but national verification system of the countries like the US will determine whether a party to the CTBT is adopting the restraints or not.
Its entry into force clause is unprecedented since it is an international treaty whose validity would come only if India, a non party, accepts it.