China warned Sunday after another round of talks on a sprawling trade dispute with Washington that any deals they produce “will not take effect” if President Donald Trump’s threatened tariff hike on Chinese goods goes ahead.

The warning came after delegations led by U.S. Commerce Secretary Wilbur Ross and China’s top economic official, Vice Premier Liu He, wrapped up a meeting on Beijing’s pledge to narrow its trade surplus. Ross said at the start of the event they had discussed specific American exports China might purchase, but the talks ended with no joint statement and neither side released details.

The White House threw the meeting’s status into doubt Tuesday by renewing a threat to impose 25 percent tariffs on $50 billion of Chinese high-tech goods in response to complaints Beijing steals or pressures foreign companies to hand over technology. The event went ahead despite that but Beijing said it reserved the right to retaliate.

Tuesday’s announcement revived fears the conflict between the two biggest economies might dampen global growth or encourage other governments to raise their own barriers to imports.