A UN Security Council panel has uncovered new instances of North Korea violating UN sanctions.
Based on information provided by Japan, Pyongyang imported thousands of computers and thousands of dollars worth of cosmetics and other items on five occasions between 2008 and 2010.
Most of those goods were reportedly shipped through China.
The panel also said it was investigating reports of possible weapons-related sales to Syria and Myanmar.
The report, which was submitted to the UN Security Council's sanctions committee this week, said implementation of the luxury goods ban was "deeply problematic" because it was up to each country to create its own blacklist.
Two rounds of UN sanctions imposed on Pyongyang for previous nuclear tests ban the sale of luxury items to the communist regime.
The North was also hit with an arms embargo, and forbidden from trading in nuclear and missile technology.