What's interesting about this?
It's a major turning point in geopolitics, involving two political genius war criminals having a remarkably frank and honest exchange of views. They're batting around the idea of Japan going Soviet at one point. I was fascinated.
There's also a truly bizarre subculture of pro North Korean longterm Japanese resident people.
It would not surprise me that in the 70s anyone in politics could believe a soviet Japan was possible. The Baath party slaughtered the Iraqi communists in the sixties, Indonesia slaughtered The Sukharno supporting communists along with passive support from the UK and Australia and USA, British forces in Malaysia were expelling 40,000 villagers for communist sympathies, communist rebels in the Philippines were firing up, and the Vietnam war embroiled Vietnam, Lao, Cambodia in the same torment. Allende would die in Chile inside the next two years: a Marxist government had been in power for a year.