Here is an interesting article in the Chosun Ilbo that discusses how North Korea goes about producing and then exporting illicit weapons:

Curbing North Korea’s illicit arms trade is difficult since the renegade country launders containers carrying weapons three or four times, a defector who was in charge of illicit arms deals told the Chosun Ilbo on Monday.

The defector revealed that a factory in Jagang Province, which is believed to produce tractors, is the center of the communist country’s weapons production, including chemical warheads. The defector, who is under police protection, did not want his identity to be revealed fearing reprisal attacks against family members still in the North.

◆ Foreign Forwarders Transport Weapons

Five departments of the North Korean government are involved in arms exports: the military arms production wing of the Workers’ Party, the Second Academy of Natural Sciences, the Surveillance Division of the People’s Armed Forces, Operational Department of the Workers’ Party and the Second Economic Committee. He said the Economic Committee, which is directly under the control of the powerful National Defense Commission, is the biggest.

The military arms production wing procures materials for the Yongbyon nuclear plant and North Korea’s nuclear weapons program. “The General Bureau of Atomic Energy only produces yellow cake [the seed material for higher-grade nuclear enrichment], while the arms production wing is in charge of the Yongbyon facility,” the defector said. The Second Academy of Natural Sciences exports missiles and also provides after-sales service for exported products by upgrading performance and exchanging components.

“The main client is the research center of Iran’s Revolutionary Guard, while experiments are conducted in unison,” he said. Iran successfully test-fired a rocket on Feb. 3 which is believed to have been powered by the same engine as North Korean Rodong missiles.   [Chosun Ilbo]

Read the entire article at the link, but I found it interesting how often China and Iran’s name came up in the article.