North Korea's effort to circumvent international sanctions on its nuclear and missile programs is complex but could be defeated by targeting relatively few Chinese firms, a report said Monday.

The Washington-based C4ADS think tank said a small number of interconnected Chinese firms accounted for the vast proportion of trade with North Korea, leaving the impoverished country's procurement network vulnerable to targeted, enforced sanctions.

The report said it was a mistake to think that sanctions could not succeed against a country like North Korea, which was less isolated than it appeared.