At the talks in Beijing this weekend, "the two sides had good exchanges of views on implementing the consensus reached in Washington, particularly in the areas of agriculture and energy", Xinhua reported.
That truce appeared to end with Tuesday's surprise announcement, which also said the White House will impose curbs on Chinese investment and purchases of USA high-tech goods and on visas for Chinese students.
It is part of China's national strategy to reform and open up, as well as increase domestic demand, said the statement, adding that China's attitude is consistent. "Our established rhythm will not change", it said.
The visit from the large USA delegation, with members from several executive branch agencies, came as fears of an all-out global trade war intensified after the European Union, Canada and Mexico drew up retaliatory measures to Washington's stinging steel and aluminium tariffs that went into effect on Friday.
As the G7 summit ended, Trump wrote on Twitter: "The United States must, at long last, be treated fairly on Trade".
Some people familiar with the matter have told Reuters that approval may depend on progress of broader talks and a reprieve from a USA government ban on sales by US companies to China's ZTE Corp (0763.HK)(000063.SZ), penalised for illegally supplying telecommunications gear to Iran and North Korea.
The statement drawn up by Canada, which hosted and chaired the meeting, held in Whistler, British Colombia, sets the stage for an even bigger conflict when government leaders of the G7 meet in Charlevoix, Quebec on June 8-9.
A report from S&P Global Ratings in early May predicted that, if the tariffs move ahead, it could lower GDP growth by 0.1 percent and cost almost 80,000 jobs in the United States. Singapore's defense minister, Ng Eng Hen, criticized both the USA and China for taking "unilateral actions", lumping the two rivals together as nations challenging the current global order.
China has warned that all trade talks between Beijing and Washington will be void if the USA sets up trade sanctions.
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The Beijing meetings came at the end of a turbulent week during which Trump fired the first shots in a global trade war by reviving plans to slap new tariffs on Chinese goods and hitting Canada, Mexico and the European Union with steep tariffs on metal imports.
Ross nonetheless journeyed to Beijing on Friday to work out details of the vague agreement Mnuchin had earlier cobbled together with the Chinese vice premier.
"Our meetings so far have been friendly and frank, and covered some useful topics about specific export items", Ross said.
Neither man has made any other comments to the media.
U.S. Commerce Secretary Ross, foreground, is in Beijing for trade talks after Washington ratcheted up tensions with a new threat of tariff hikes on Chinese high-tech exports.
The trade skirmish further escalated when the United States banned ZTE Corp., one of China's biggest telecommunications companies, from purchasing USA components for seven years due to several concerns ranging from security to violating US sanctions.
USA allegations that China steals company secrets are at the heart of the ongoing trade dispute between the world's two biggest economies.
"I want to be clear, this isn't just about [China] buying more goods, this is about structural changes", Mnuchin said.
"I think we have very broad objectives that are across a rebalancing of the trade relationship and the trade deficits", Mnuchin said.