NPT upgrading is long overdue. Both leader come together with common sense and have right thing. On Indian perspective, She is surrounded by Few rough states like Pakistan, Iran and China, and all these are sponsoring terrorism and spilling the beans all over ME and SE Nations. China is real threat for India's stability and existence. And We need Missile Defence system to guard our sovereignty and securing our border. In this respect, The technology for MDS and its know how only known by America and Russia to some extent and they are developing. It is good for India to have MDU with USA, Indian Govt. must procure such MDS from uncle Sam and deploy them near China's border. These Missiles have the capacity to stop oncoming missiles from these rough states. India has a bad experience regarding China's Politicking with India. So, be safe than be sorry.
