So it'll be better idea to run away & save your life. China will definately be a safe harbour for all commies. BTW , it will be a Paki Nuclear Bomb which will destroy India & not a US one. And India will be more safw with strategic alliance with USA , as their Intelligence are deep indside Pakistan & they have better control over their Nuclear Arsenal than any other country. US had already saved India in 1962 , against Chinese Aggression & Now also US will never want to destroy India due to their Business Interest & as a stretegic counter weight against China. Only becuase of America , China is afraid of attacking India , otherwise they had already occupied Arunachal Pardesh & Sikkim. So , in the scenario of two Powers, you've to be on the side of any of these & India was with USSR in Cold war Days & nor when China had taken place of USSR , there is no option left for India than to be on the side of USA , as it cant trust on China , who has already occupied thousands miles of Indian Land & want Arunachal & Sikkim as well.