Eric Shawn has latest on leaked United Nations report about partnership between Pyongyang and Tehran A leaked report on North Korean sanctions by a UN Security Council committee reportedly states that Kim Jong Un's regime and Tehran are working together... again, to develop long range ballistic missiles. Some experts say those missiles could hit the American mainland. "North Korea is a serial proliferator," says Sung-Yoon Lee, a leading North Korean expert at the Fletcher School of Law and Diplomacy at Tufts University. "This is a long and very close partnership between North Korea and Iran." Bloomberg News first revealed the relationship between the two US foes in the yet-to-be-released UN report, where it also noted that North Korean scientists have been working at Iran's space program headquarters. It has long been known that Iranian scientists have attended North Korea's nuclear tests, as both states share technology to develop missiles that can potentially carry nuclear warheads.