Former US ambassador John Bolton speaks to a packed audience at the Foreign Correspondents' Club in Hong Kong on January 8, 2009. China could end North Korea's nuclear drive by threatening to cut off its energy supply the former US ambassador said. Getty Images logo Getty Images 10 months ago

Former US ambassador John Bolton speaks to a packed audience at the Foreign Correspondents' Club in Hong Kong on January 8, 2009. China could end North Korea's nuclear drive by threatening to cut off its energy supply the former US ambassador said.