This is not missile seekers or even missile technology. This is passive IR that is as capable as radar for targeting and engagement without the emissions.
https://www.lockheedmartin.com/en-us/products/irst21-sensor-system.html
"...super secret technology that the Russians have and they stop the attack as a result of their brilliance? Yeah, me neither
Seems I heard that before about the Mig-15, Mig-21 and SA2. My father heard that about the Zero in WWII.
“Seems I heard that before about the Mig-15, Mig-21 and SA2. My father heard that about the Zero in WWII.”
We were sweating pretty hard the first time we got a look at the IS series of tanks too. It does not pay to be arrogant about ones own military technology.