North Korea has a known track record in proliferating nuclear and missile technology and in 2001 , missile sales came to $ 560 million . Following its 2006 nuclear test , international sanctions have sought to limit or prevent North Korea from exporting various types of arms , materials , and technology . Prior to UN sanctions however , countries such as Japan and the United States took unilateral steps to curb such activities
2006 nuclear test
2006 North Korean nuclear test
North Korea's illicit activities