Sukhoi T-4 Sotka

First of all, I'm new so hi everybody.
I've got a question about the Sukhoi T-4 the Russians built in response to the XB-70. From what I know, it only had ten flights and was designed to reach mach 3, but only reached Mach 1.3 in testing. It is also believed that it set a 2000 km circuit record of Mach 1.89. Do you think that this aircraft was maybe cancelled because it couldn't reach its M3 goal and the Russians never disclosed the aircraft that set the record because if they did, it would have shown that the T-4 couldn't cruise at Mach 3? So, since the Mig-25 was also not really a M3 plane, do you think that the Soviets ever had a legit Mach 3 aircraft?

en.wikipedia.org...

a potted history - but from my understanding it was cancelled because other aircraft could actually do the same job and the place was out of date before it even flew because of the advnce in US SAM systems made it redundant

and

en.wikipedia.org...
was the replacement