Japanese police have arrested a North Korean citizen on charges of selling luxury foreign cars to the North through South Korea.

Japanese media said that the North Korean man, who resides in Tokyo and was identified only by his surname “Ahn,” is charged with violating Japan’s foreign currency law.

Ahn is accused of illegally exporting three used Mercedes-Benz cars to North Korea without the Japanese government’s permission. The cars were shipped to the communist country from Japan’s Kobe port via South Korea’s Busan and Incheon between September and December 2008.

This is the first uncovered illegal export scheme to use South Korea as a stopover between Japan and North Korea. China is generally the popular channel for illegal exports between the two nations.

Japanese police also believe that Ahn is a North Korean spy.