North Korea's continued efforts to undertake prohibited nuclear tests and ballistic missile launches despite multiple rounds of sanctions call into question the United Nations' sanctions regime, according to excerpts of a U.N. report obtained by Kyodo News.

The report also mentions a drone bearing a resemblance to Chinese-made drones that was found on a South Korean island and recommended expanding a ban on unmanned aerial vehicles, which currently are limited under Security Council resolutions.

The recommendation could put pressure on China, North Korea's main supporter and chief supplier of goods, which appears reluctant to step up measures for fear of heightening regional tensions. The report is to be presented to the Security Council next month.