A UN panel of experts says North Korea earned almost 200 million dollars past year from commodity exports banned by UN Security Council resolutions.
Pyongyang is subject to sanctions from the US, UN and European Union over its nuclear and ballistic missile programmes.
The report said Pyongyang also shipped ballistic missiles, air-to-surface missiles and rocket launchers to Myanmar. The latest resolution in December - in response to the launch of a ballistic missile that Pyongyang says is capable of reaching anywhere on the USA mainland - sharply lowered limits on North Korea's refined oil imports and authorized the inspection and seizure of ships suspected of smuggling banned items including coal and oil to and from the country.
The panel of experts' report also warned of continuing cooperation on ballistic missile development between North Korea and Myanmar and Syria, which have been providing logistical support, military technicians and intelligence operations and using front companies.
The report to a U.N. Security Council sanctions committee, seen by Reuters on Friday, said North Korea had shipped coal to ports, including in Russia, China, South Korea, Malaysia and Vietnam, mainly using false paperwork that showed countries such as Russia and China as the coal origin, instead of North Korea.
The United States led the push for tough economic sanctions after North Korea's sixth nuclear test and a series of ballistic missile launches that raised fears that the U.S. mainland could soon be within range. However, diplomats and weapons inspectors suspect Syria may have secretly maintained or developed a new chemical weapons capability.
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According to a panel of experts, both Syria and Myanmar continue to work with North Korea's main arms exporter, KOMID, which is on the UN's sanctions blacklist.
Security Council sources say the North's methods of avoiding sanctions have become increasingly sophisticated as the United Nations sanctions have tightened.
Seven ships have been barred from ports worldwide for violating United Nations sanctions with coal and petroleum transfers, but the experts said much more must be done to confront "these rampant illicit activities".
Pyongyang also appeared to have cooperated with Syria and Myanmar in ballistic missile development, according to monitors.
Syria denied co-operation with North Korea on their chemical weapons programmes, saying that the only experts it was hosting from the country were involved in sports.
"This year could represent a critical window of opportunity before a potential miscalculation with disastrous implications for worldwide peace and security", the experts said.