With the flick of a switch in Washington, a lifeline of independent news into North Korea has gone dark, prompting warnings that it will leave the country’s 26 million people more isolated than ever.The abrupt halt to funding, passed by the US Senate earlier this month, ends long-standing American support for cross-border broadcasts and clandestine media channels that provided North Koreans with one of the few opportunities to access information unfiltered by state propaganda.Among the most...