A classified United Nations report says North Korea and Iran have routinely shared ballistic missile technology in violation of U.N. sanctions, and diplomats say China has sought to block release of the report.
The document, seen by Western journalists, says the illicit technology transfers passed through a neighboring third country, which diplomats identify as China, North Korea's closest ally. Beijing has not commented on the report, which also includes accusations the technology was transferred aboard regular air flights of Air Koryo and Iran Air - North Korea’s and Iran's national airlines.
The U.N. Security Council imposed sanctions against North Korea after two nuclear tests in 2006 and 2009. Iran is also under international sanctions because of its uranium enrichment activities, which the United States and its allies suspect are weapons-related. Iran insists its nuclear program is for peaceful purposes.

