It was a MIG-25 flown to Japan in 1976. The pilot ended up in the USA and after being debriefed he was given money, a small aircraft, and allowed to fly around the USA.
As far as the Foxbat itself, the Soviets did not spare money or resources on parts of the aircraft that didn’t need to be given the best treatment. Surfaces that did not directly affect the flying characteristics were made of whatever needed to make it work. It was not a work of art but a collage of the best reverse tech they could muster and spit and bailing wire if it would function correctly.
He wrote a book, “MIG Pilot” and his name was, Viktor Belenko. He passed away here in the USA in 2023. I read that book after it was first released and it cemented my hatred for communism. The last chapter regarding his observations traveling the USA and the comparison and contrast to that of the USSR was excellent. I was an Active Duty USAF E3 at the time.
I must go to the library and check out that book, “Mig Pilot”. Thanks for the tip.