Uh, you may wanna run that back. I'm not talking about the origin of the technology here, I'm talking about the circumstances of their development.
The F-15 was developed as a response to the Mig-25, this is a fact of history.
Here’s why the MiG-25’s rugged airframe led to the development of the F-15, the premier air superiority fighter of the 20th century
theaviationgeekclub.com
So the only thing you have is this sentence...
It is interesting to see how the F-15 (and indeed all fighters of that time period) were influenced by the MiG-25.
What does 'influence' mean? Basically, it mean anything the reader want it to be. If the reader is captured by physical similarities, then he will
ASSUME that the F-15's physical structure was relatively copied from the MIG-25. If the reader is a more critical sort, the word 'influence' is meaningless.
The MIG-25 was developed in response to the XB-70 as your source stated...
It had to be able to reach the speed and altitude of American B-70 bombers,...
If you want to remain with physical similarities, then you cannot ignore the A-5 Vigilante because the physical similarities between the A-5 and the MIG-25 is essentially overwhelming. Do you want to use the word 'influenced' here? Why not the F-15 was 'influenced' by the A-5? But of course, to suck up to Russia, it had to be the MIG-25.
When I was active duty, our squadron had a chance to attend a technical presentation of the MIG-25 that started from when Viktor Belenko defected to the West with his MIG-25. To put it bluntly, the MIG-25 was, and still is, crap. To start, there is nothing wrong with being a niche platform. The SR-71 is a niche platform. The MIG-25 was designed to try to go after the XB-70 and possibly the SR-71. Whereas, the history of the F-15 contained the F-4, F-111, A-7, and several others, basically, the question was: What the previous jets cannot do, can the F-X program do it? And if you look at the history of those other fighters, most of them are multi-role to varying degrees in employment. The F-15 was intended to be better than all of them.
You can strain the context of the word 'response' to give some needed credits to Russia, but not to me. The MIG-25 was crap, and
STILL is crap.