Actually, the MiG-25 was designed and built in response to the XB-70 Valkyrie bomber, which was cancelled after the USAF realized that it would never
be able to survive the high-altitude SAMs the Soviets were designing in the 1960's.
The Soviets where threatened enough, however, to build a response to the XB-70, which ended up being the MiG-25. By the time the XB-70 was cancelled,
the MiG-25 designs were far enough along that the Politburo decided to continue with the design (it was a radical new design that showed alot of
promise).
Ironically, when the USAF got wind of the MiG-25, they freaked out. They completely overestimated its performance capabilities, thinking it was a new
breed of air dominance fighter, when in reality it was a long-range interceptor with limited maneuverability. But the USAF was worried enough that
they eventually came up with the F-15 Eagle as a direct response to the MiG-25.
When Victor Belenko defected with a MiG-25 to Japan in the late 1970's, the USAF was very surprised to learn that the MiG was not what they
envisioned. They came to realize that it was designed to get off the ground quickly, gain altitude quickly, cover alot of ground, and engage high
flying targets at long range with massive AA missiles and a high-power AI radar (just what you would need to shoot down a B-70).
The MiG-25 was a natual fit for the recce mission, as it flew so very high and fast. I believe the Foxbat B and D are the recce models, and they have
been used in combat recce missions all over the world with good success. Most notably in the 1973 Israeli War, Egyptian MiG-25's (with Russian
pilots) flew many recce missions unmolested over the heart of Israel while Israeli Phantoms and Mirages helplessly flew below them. Only the deliver
of American F-15's equipped with Sparrow missiles later in the 1970's put a damper on these operations.
The other aircraft in the posted pictures looks like an unmanned, land-based drone/RPV which I believe is based upon the SS-N-3 Shaddock missile
system.
As far as I know, now Soviet aircraft has ever penetrated continental US airspace without an escort from the USAF or ANG. Bear D's used to go up and
down the East Coast all the time on their way to Cuba, and many different Soviet aircraft have flew near or over Alaskan airspace. But who knows.
I'm sure there are some classified instances that the USAF is not willing to tell us about.