The White House said in a report on Thursday that more than 40 countries had helped China sidestep US tariffs by routing exports through nations that face lower American import duties.
The countries named include Canada, India, Mexico, Japan and South Korea, which the White House said had helped China evade tens of billions of dollars in tariffs, which are levied on companies importing goods.
White House trade adviser Peter Navarro said it had cost “American jobs and billions in revenue”.
A spokesperson for the Chinese embassy in Washington said “trade wars have no winners” and that it opposes the US tariff measures and the use of state power to target China’s companies.
“Any unilateral actions or agreements concerning transshipped goods must not target or harm the interests of third parties,” the spokesperson added.
The BBC has contacted the US embassies of Canada, India, Mexico, Japan, South Korea and other trading partners listed in the report for comment.
The report follows a wave of sanctions between the US and China and comes weeks before US President Donald Trump will meet Chinese leader Xi Jinping in Washington.
Between $30bn (£22bn) and roughly $300bn in goods have been moved from countries with higher tariffs through those with lower rates, according to government and private sector estimates quoted by the White House.
The process is known as transshipping, which refers to the practice of transferring cargo through another country while en route to a final destination.
The US accused China of “taking advantage” of the practice by moving goods through nations that have lower import duties.
China has used third countries as a stopover and has repackaged goods to hide their real origin to obtain lower tariffs, the White House said in its report, describing the process as “fraud cloaked in paperwork”.
“What has changed in today’s Great Transshipment Scam is not merely the speed and scale of this modern form of smuggling, but the breadth, depth, and sophistication of the global Shadow Transshipment Network through which China’s tariff evasion now moves,” the White House wrote.
The US has deployed artificial intelligence tools to catch transshipment efforts, it added.
