Revenge, God's Vengeance, and Loving One's Enemies

Is there a higher ethic in the NT as opposed to the OT? No. Jesus is correcting Pharaisaical misunderstanding and miss application of the Mosaic Law. Loving one's enemies is in the OT. Both Testaments instruct us not to show personal revenge but to leave that to God, who will avenge us if necessary. Jesus said not to resist evil and turn the other cheek. Does this prohibit self, family, and national defense? What did Jesus mean in telling us to not resist evil?