NEWYou can now listen to Fox News articles! The U.K. on Monday announced new plans to overhaul its defensive posture in the wake of Russian President Vladimir Putin’s invasion of Ukraine and potential challenges posed by President Donald Trump’s threat to withdraw U.S. troops from the continent. British Prime Minister Keir Starmer said he would bring his country to ‘war-fighting readiness’ by investing dozens of billions of dollars in the building of 12 submarines, weapons...