North Korea has urged Mexico to free one of its ships detained in Veracruz state in 2014.
It has accused Mexico of illegally holding its Mu Du Bong ship, after it ran aground last year.
Pyonyang blames the United States for making sure the ship is not released.
North Korea said the Mu Du Bong was a legitimate commercial ship and its detention a “rampant violation” of sovereignty.
However, a UN expert says the ship belongs to North Korea’s Ocean Maritime Management, which is on a UN blacklist.
In July 2013 one of North Korea’s ships was seized in Panama after Soviet-era weapons and fighter jets were found hidden under sugar sacks.
Under resolutions adopted after Pyongyang’s nuclear tests in 2006 and 2009, the export of all arms and related parts, with the exception of small arms and light weapons, to the communist country is prohibited.
The Mu Du Bong ran aground on a reef off Mexico’s Veracruz state in July 2014. North Korea says it has since paid a bond to cover damage to the reef.
Speaking at a news conference at the UN on April 8, North Korea’s deputy ambassador An Myong Hun said the ship and its crew should be released.
“This ship is totally a peaceful and legitimate commercial ship which sails under the direction of the Ministry of Land and Sea Transportation,” he said.
“The detention of Mu Du Bong is a rampant violation of the dignified sovereignty of the DPRK [North Korea].”
But Hugh Griffiths, co-ordinator of the UN panel that oversees sanctions violations, told journalists that there was “overwhelming” evidence to show the ship was linked to OMM.
A spokesman for Mexico’s UN mission, meanwhile, told AFP news agency his country was “fulfilling our international obligation under Security Council resolutions”.
OMM was blacklisted by the UN in July 2014. The UN said it had played a key role in arranging the shipment of concealed arms found in Panama.
[youtube HG0km2qvXkY 650]