There is no stopping that... however redundancies should be there to provide needed back up... along with spoofing... phantom emitters... GPS etc.
However, these are all for frontal attack or defense. What Iran faces is multi-dimensional. It is engineering and coercion on every level financial, social, agricultural... food and water, technological, cultural, religious and ethnic.
There is no domain intact... sacred or unscathed... in fact consider the normal with suspicion first...
This is the problem with playing defense... because aggressor will keep looking for chokepoints and loopholes. Instead they should have flipped the script on zion... let them play defense and bolt to their home countries.
Imposters need impetus...
The game of defense is lost once Trojans find their way in!