The United Kingdom will build new nuclear-powered attack submarines and create an army ready to fight a war in Europe as part of a boost to military spending designed to send a message to Moscow — and Washington. Prime Minister Keir Starmer said Britain “cannot ignore the threat that Russia poses” as he pledged to undertake the most sweeping changes to Britain's defenses since the end of the Cold War more than three decades ago. “We have to recognize the world has changed," Starmer told the BBC.