LONDON (AP) — Self-flying fighter jets, uncrewed submarines and drones will be at the center of Britain’s future military under a defense plan being announced Tuesday that reflects a world of conflicts transformed by technology.

The Defense Investment Plan has been repeatedly delayed as military leaders and Treasury officials wrangled over the cost of equipping the U.K. military for an increasingly dangerous world. Like other NATO countries, the U.K. is under pressure to increase defense spending to counter a more aggressive Russia and less reliable United States.