Italy will not go to war against India. It simply does not have the capability for that kind of expeditionary warfare. And NATO is not going to invade a nuclear power, for the sake of your drunken and incompetent marines.
Stop living in your delusions of grandeur. This is as pathetic as Pakistanis believing that China will fight their wars for them. No, Uncle Sam and NATO will not come like knights in shining armour. And by itself, Italy cannot even wage war on Pakistan, to say nothing about India. You are not a military power, and the ones that are big powers are not going to fight your wars for you. The world doesn't work that way. You are too naïve to think that. Sorry, but you are not that important. Heck, the marines are not important enough for Italy to go to war - and you think NATO will care.
The have already spent quite a few days in Indian jails. Here is a picture of the Kerala police ordering them around in Ernakulam central jail: