China's trade with North Korea plunged 50 per cent in the last month as UN sanctions imposed over Pyongyang's nuclear and missile development tightened. China accounts for nearly all of the isolated North's trade and energy supplies. <br/><br/>Beijing has imposed limits on oil sales and cut deeply into the North's foreign revenue by ordering North Korean businesses in China to close, sending home migrant workers and banning purchases of its coal, textiles, seafood and other exports.<br/><br/>A spokesman for the Chinese customs agency said, imports from the North shrank 81.6 per cent to 54 million US Dollars last month while exports to the isolated, impoverished country contracted 23.4 per cent to 260 million US Dollars.