Prior to UN sanctions however , countries such as Japan and the United States took unilateral steps to curb such activities .
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 countries such as Japan and the United States took unilateral steps to curb such activities .
Following its 2006 nuclear test , international sanctions have sought to limit or prevent North Korea from exporting various types of arms , materials , and technology .