在网上看到的一个说法，关于米格-25飞3.2马赫以色列F-4 ...

The story goes that the top speed of the Mig-25 was Mach 3.2.
The legend says that once an Israeli radar clocked a Mig-25 flying mach 3.2 over their territory, but when the Mig got home, the engines were destroyed. That is not the truth.
The truth is, in the late 60's, the Air force clocked some unknown aircraft flying over the arctic at Mach 3.2 apparently to collect signals intelligence.
At the time, the US Air force had just been alerted to the presence of the Mig-25, and was unsure of its speed or range.
Our intelligence assumed that this aircraft was the Mig-25, in fact, it was an unmanned surveillance aircraft, called the Tu-121, and sometimes the Tu-133. It was capable of carrying a nuclear warhead or reconnaissance equipment, including radar mapping equipment. It was also used by Russian forces to simulate the B-70 and SR-71.
The Mig-25 was built out of nickel steel, not titanium, so it was immensely heavy and limited. The foxbat A had a top speed of mach 2.5, and later versions had slightly higher top speeds. This was verified by US forces after testing the Mig-25.
It became more obvious that the Mig-25 was slower than previously thought when in march of 1981, the mach 2+ capable F-15 shot down an armed Mig-25 with a Mach 2.5 Aim-7C sparrow missile.
The Mig had been in an all out sprint to intercept a F-4 phantom, and the F-15 took it down before it could reach its target.
Many people do not realize the meaning of that victory. The aim-7c was a terrible weapon, with less than a 16% hit ratio. The kill would have been unexpected on any aircraft, let alone the mythical Mig-25.
So after all that, No, the Mig-25 was not capable of catching the SR-71.
The Sr-71 could cruise at mach 3.2, and even if the mig could go mach 3.3, thats only 60 mph faster.
The Mig-25 has a 500 mile range, and at mach 3.3, that takes 15 minutes. That means the Mig 25 would have to start from a position that it could overtake the Sr-71 within 15 minutes. At a 60mph overtake, it would have to start at the same altitude, at mach 3.3 within 15 miles to intercept the SR-71. Impossible.
That makes it even more obvious that the Mig-25 was lower performance than thought, seeing that a F-15 shot one down.

为打破以色列预警机的优势，叙利亚空军在继2月13日的袭击5个月后的7月29日再次图谋对E-2C发动袭击。以色列空军 F-15A及时进行了拦截。与2月的作战相同，F-15A在低于米格-25ПД的高度上用AIM-7F中距导弹进行仰射，据称射击高度差将近6000米。这次战果被法国电视记者拍摄下来，当天19点的电视黄金时段，全世界大约数亿人看见了这架机体中部被炸出巨大缺口的米格-25ПД万米高空像树叶那样飘落而下。由于发动机早已停车，残骸如同竹蜻蜓一般水平旋转垂直坠落，燃烧的机体在天空中拉出几千米高的烟柱。距地面1000米左右的空中一侧机翼被旋转甩飞，残骸姿态变成斜切砍向地面小高地顶上的四层居民楼，随后发生大爆炸。电视播音员解说飞行员此前已经丧生。