[WWII] What happened to ambassadors when the nation they're from went to war with the country they're in? Were they sent home? Captured? Or treated as a POW?

by A_Sweet_Lemon

i.e. Hans-Adolf von Moltke, André François-Poncet, Joseph Clark Grew, Kichisaburō Nomura, Józef Lipski, etc. etc.

(If any of these were already in their home nation during the declaration, please ignore them.)

Georgy_K_Zhukov

More of course can be said, but I touched on a few examples here.