Making the RV maneuverable can be helpful but even this characteristic is not sufficient in the light of recent advances in missile defense applications: https://defence.pk/pdf/threads/us-ballistic-missile-defence.373066/page-5#post-11579124 MiRV technology is an important consideration but very challenging and expensive endeavor. Alternatively, WE will have to continue to increase the count of our nuclear delivery systems for indefinite period but how many WE can afford in the long-term? Numbers game in the nutshell. An arms race can become really costly in the long-term and can literally bankrupt a country in the process. Indian missile defense program is not much of a problem at present* but a matter of concern regardless because it is advancing over time even if at a slow pace. *India is far behind US in this matter. Pakistan is also developing cruise missiles for the needful which is a RELIEF because cruise missiles are very difficult to detect in terrain-hugging mode and can slip through even capable defenses and/or bypass them altogether. Still, nobody know for sure what will be the outcome of a full-scale war with India, God forbid.