UK boosts military spending by $20 billion but critics say it's not enough

Self-flying fighter jets, uncrewed submarines and drones will be at the center of Britain’s future military under a defense plan announced Tuesday that includes a 15 billion pound ($20 billion) spending boost.

Like other members of the North Atlantic Treaty Organization, the UK is under pressure to increase defense spending to counter a more aggressive Russia and less reliable US.

But its Defense Investment Plan has been repeatedly delayed as military leaders and Treasury officials wrangled over ...