iran- US accuses China of flouting sanctions by docking in North Korea and loading up on fuel'

China violated the sanctions, why?
Chinese companies have been violating UN sanctions against trading with North Korea, according to U.S. officials.
Cargo ships have been photographed docking in North Korean ports to take on coal, which has then been brought to Vietnam and Russia or unloaded onto other ships mid-sea, the Wall Street Journal reports.
All cargo ships, six in total, are all either Chinese-owned or operated, and were tracked by the U.S. using satellite technology.
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