Four North Korea-linked vessels called in at Chinese bulk ports over the last seven days, despite UN embargos against many of the DPRK’s metals and minerals, the NK Pro ship tracker shows.

The continuing ship traffic comes around 30 days after China implemented UN resolution 2371, which prohibits member states from importing several of the North’s most lucrative exports.

Successive UN resolutions now prohibit countries from buying North Korean coal, iron, lead, silver, gold, copper, zinc, titanium, nickel, vanadium and rare earth minerals.