China has exempted some U.S. imports from its 125% tariffs and is asking firms to identify critical goods they need levy-free, according to businesses notified, in the clearest sign yet of Beijing's concerns about the trade war's economic fallout.

The Trump administration has been saying that the two countries are engaged in talks to resolve the dispute, but Beijing asserts that no such discussions are happening.

The outlook of an all-out trade war between the U.S. and China remains a central question for the global economy, but the two sides appear to disagree even about whether talks have begun. President Donald Trump late Wednesday said the world’s two largest economies are “actively” discussing trade issues.