The message of Jehovah for Nahum to give was written to "the great city" of Nineveh about 200 years after
they were allowed "a stay of execution" because of their repentance (Jonah).
However, they fell back to their old ways. It is highly possible (basically
inevitable) some may do this during Michael's reign (Isaiah 65:20)
Nahum 3:1 "Woe to the city of bloodshed. She is
all full of deception [and] of robbery. Prey does not depart!" - The
city of Nineveh