[XR0CSWV3h3kZWg]

I haven't heard of missile defense systems that are capable of determining the origin of an ICBM while deciding if it should try and take it out.

[jccooper]

Infrared boost phase detectors on satellites have been around since the 60s. The US and Russian detection systems, at least, certainly know the origin of any ICBMs. There's not many parties that don't have that data and also have counter-measures.