The US and the EU repeatedly told Japan to stop it's invasion. Japan did have some cassus belli initially but after several atrocities happened the response gre

The US and the EU repeatedly told Japan to stop it's invasion. Japan did have some cassus belli initially but after several atrocities happened the response grew much louder - specifically after a pastor was killed by a stray bomb and the photograph made it's way back to western audiences with an accounting from his daughter.