May be they are trying to provoke us into starting war. If we shoot down the helis they will show it as a reason to start a war and can escalate into a full scale war. I think there is a procedure in place to follow in case of intrusions. One, it will have to be intercepted by an fighter A/C and force it to land in Indian air base and find out the real intention of the heli, so that we can evaluate the situation and can take future discourse which can be warning them from doing such intrusion into our space and that next time, if repeated, will be shot down without warning.