The USA and Britain announced they would help Australia deploy nuclear-powered submarines (not nuclear-armed), taking a major step in challenging China’s broad territorial claims of its exclusive zone in the South China Sea. The announcement is a major step for Australia, which until recent years has been hesitant to push back directly at core Chinese interests. The decision to share technology for naval reactors, even with a close ally, is a major move for President Biden and bound to raise protests by the Chinese and questions from American allies.