Since we're the one who will set the target for Df-21D to lock on...we will have already decide the fate of your warship before hand...any your civilian cargo ship will be not harm unless Indian navy has intention to harass our cargo in international water. And sure go ahead ..why not since we use DF-21D to deal with Indian Navy, it's fair for you can use your Agni to target our far far away warships
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Regardless if i'm beginner or not, I'm just offer solution to China's India problem
, Assuming that DF-21D cost 7 millions, 14 billions will equipped China a 200 chances to sink or damage Indian warship and with conservative estimation of 50% error, China still able to sink or damage 100 warships...how many warships India possessed in total? is India navy worth more than 14 billions?