India is receiving valuable input from Russia and Israel in the matters of its BMDS.
Not Russia, France and Israel.
However, Indian BMDS is in testing phase, and not close to being operationally relevant yet.
India needs a decade or two, to establish a comprehensive BMDS.
The Phase 1 is ready for deployment and has been designed to stop anything Pakistan has in its arsenal meant to attack North and West India.
But South and East Indian cities are partially open to attack and require Phase 2.
We don't need a decade or two. The entire system for Phase 1 will be up and running very soon. And Phase 2 will be developed much faster than Phase 1 since the foundational technologies are already almost complete.
This will be the initial Phase 1 set up:
The early warning sites for Phase 1 have already been decided.
So the Phase 1 interceptors with their FCRs and C&C units can be placed anywhere inside the blue circles, up to a distance of 1000Km from the centre, and will provide BMD within the circle. You can imagine small 50Km radii peppered around inside the big circles.
When you get there, then we'll talk.
You said the same thing about nukes, yet look where we are now.
Stopping decoys was the problem. But stopping MIRVs is not as big a technical challenge, it's more of a financial and numerical challenge.
MIRVs are designed for saturation attacks and overwhelm BMD while at lower cost to the attacker. Firing 3 missiles with 3 warheads is more expensive for the attacker than 1 missile with 3 warheads. But the actual BMD process itself is the same, with the exception that the BMD has lesser time to react.
Earlier, 1 missile could drop only 1 warhead, so we had to earmark only a few missiles for BMD. But with MIRV, we now have to earmark many times more missiles for BMD.
With increasing number of targets, we need to increase launchers, missiles and fire control radars. So the main idea is to increase the financial burden on the defender, while making it cheaper for the attacker.
In the recent test, we could separate decoys from the warhead, which is a much, much harder task than defeating MIRVs.