Does Buddhism endorse pacifism in times of injustice?

How would a monk or a Buddhist answer look like in dealing with injustices like murder, rape, torture? If we refer to Dhammapada 3, the victims get instructions how to deal with those misfortunes, but what about the perpetrators? Would a Buddha not support the actions of military forces -- who kill their opponents -- if their opponent's regime were involved in "wars of aggression" and mass murder of civilians, i.e. "crimes against humanity"? How would a PRACTICAL Budddhist response look like?