Pakistan, China pose biggest nuclear threat to US, says Tulsi Gabbard

US intelligence chief Tulsi Gabbard on Wednesday said that Pakistan is among the countries posing the biggest nuclear threat to the United States.During a briefing, Tulsi Gabbard also named Iran, China, Russia, and North Korea as nations actively developing new missile delivery systems, including both nuclear and conventional warheads, which put the United States within range. "The intelligence community assesses that Russia, China, North Korea, Iran, and Pakistan have been researching and developing an array of novel, advanced, or traditional missile delivery systems, with nuclear and conventional payloads, that put our homeland within range," Gabbard said.During the briefing, the US intelligence chief also said that North Korea is strengthening its partnership with Russia and China.Gabbard said the US "obliterated" Iran's nuclear enrichment programme in June last year. She added that the US has, since then, seen no effort to rebuild Iran's enrichment capabilities.(This is a developing story)