Optimism that Beijing and Washington will eventually hammer out a partial agreement as part of a wider deal has supported equities for weeks, helping Wall Street to numerous records.
Sparkling wine, yoghurt and Roquefort cheese could be hit as soon as next month, while US Trade Representative Robert Lighthizer warned his office was also considering similar moves against Austria, Italy, and Turkey.
"If nothing happens between now and then, the president has made quite clear he'll put the tariffs in," he said. But he added:"While there is a clear economic incentive from both sides to do some sort of deal, the political desire to reach more than the minimum is weak, as the two sides are still going to want to compete in areas such as technology."