Watching the Skies in Japan: Mishima Yukio and Other UFO Enthusiasts
nippon.com
nippon.com
The far right-wing Japanese military killed 3 Prime Ministers in a row just before WW2. The US diplomatic corps actually gave up on peace talks, in part because they didn't know who to talk to.
The Emperor(!) was also targeted for wanting peace in 1945, and ended up recording his national address speech on tape in case he was killed before reading it on radio. He was a scientist (marine biologist), so knew what an atomic bomb was in general terms.