> When the Japanese bombed Pearl Harbor with a sneak attack the US did not storm the Japanese embassy, they did not hold Japanese diplomats hostage. They did not claim that the Japanese diplomats were secretly spies. Etc. That sort of boorish behavior is not and should not ever be tolerated. If you cannot tolerate the continued presence of a country's diplomats in your country then you eject them, you do not hold them hostage. Period.
Roughly 400 Japanese Embassy staff (including diplomats) were actually held by the FBI and used in trade for American embassy staff who were stuck in Japan. Same was done with German and Italian diplomats. They were reportedly held comfortably at resort compounds the government took over. While they were treated much better than other Japanese in the US at the time they were still held against their will, and were used as currency to recover American staff.
> They did not claim that the Japanese diplomats were secretly spies.
No idea about the Japanese but several employees of the German embassy were arrested for 'spying'.