The escort role has been diminished as modern air combat doctrine places a heavy emphasis on the idea of air superiority, and its importance in the ability of an air force to carry out effective operations. Air superiority is defined as a situation in which an air force dominates an airspace to such a degree as to be able to carry out any operations with no interference from enemy air combatants. Fighting an opponent with air superiority in a given battlespace is much harder, as any offensive or defensive tactics are likely to be overwhelmed.