Bank of China cut business with North Korea 's main foreign exchange ban . Many Chinese businesses maintain close trading relationships with North Korea , giving the country access to vital commodities and hard cash . Comment: China is North Korea 's closest economic partner . Move may also reflect bank risk management rather than bigger diplomatic motive .
Bank of China cut business with North Korea 's main foreign exchange ban . Comment: China is North Korea 's closest economic partner . Move may also reflect bank risk management rather than bigger diplomatic motive .