Shiro Ishii, a Japanese general who oversaw Unit 731 and thousands of horrific war crimes during WWII, was given immunity in exchange for human experimentation data, and may have gone on to do bio weapons research in Maryland.
Stalin’s eldest son died as a Nazi prisoner of war during WWII, after Stalin refused multiple offers to exchange him for German prisoners held by the Soviets.
Only one Japanese soldier was captured during the Attack on Pearl Harbor.
The Japanese temporarily occupied the Aleutian Islands (Alaska) during WWII. This was the first time Canadian conscripts were deployed to a combat zone.
There is a 32 km² desert in Poland and the Germans used it to train before deployment in Africa during WW2.
Devyatayev was a soviet pilot who was captured by the Nazis in 1944 and managed to steal a German airplane from a heavily guarded Nazi military base. On his return to the USSR his plane was shot at, and was then labeled as a spy because his story was so unbelievable.