Percentage of North Korea's trade is with China and relies on coal as its No. 1 export. Despite global sanctions, China imports from North Korea citing "livelihood exemption," which allows the export of a product if cutting it off might affect the livelihood of the exporter, so long as the revenue doesn't go to North Korea's nuclear program.
Percentage of North Korea's economy that many analysts believe is dependent on coal exports.
18 Feb 2017
China froze all imports from North Korea till the end of the year without citing a reason. But by all accounts its in response to Pyongyang test-firing a missile into the Sea of Japan, drawing international rebuke, and just days ago, North Korean dictator Kim Jong Un's older half brother died mysteriously in Malaysia.