China's tough rhetoric leaves trade talks with U.S. in limbo

(Adds Commerce Department says it may scale back some Huawei restrictions)

* China calls on U.S. to show "sincerity" in talks

* Trump delays decision to impose auto tariffs

* Investors jittery over possible trade war escalation

* U.S. may scale back some Huawei restrictions

By Ben Blanchard and David Shepardson

WASHINGTON/BEIJING, May 17 (Reuters) - China struck a more aggressive tone in its trade war with the United States on Friday, suggesting a resumption of talks between the world's two largest economies would be meaningless unless Washington changed course.

The tough talk capped a week that saw Beijing unveil fresh retaliatory tariffs, U.S. officials accuse China of backtracking on promises made during months of talks and the Trump administration level a potentially crippling blow against one of China's biggest and most successful companies.

Chinese foreign ministry spokesman Lu Kang, asked about state media reports suggesting there would be no more trade negotiations, said China always encouraged resolving disputes with the United States through dialogue and consultations.

"But because of certain things the U.S. side has done during the previous China-U.S. trade consultations, we believe if there is meaning for these talks, there must be a show of sincerity," he told a daily news briefing.

CNBC, citing sources, said the trade talks had stalled and the next round of discussions was "in flux."

The United States raised Beijing's ire this week when it announced it was putting Huawei Technologies Co Ltd, the world’s biggest telecoms equipment maker, on a blacklist that could make it extremely hard to do business with U.S. companies.

The U.S. Commerce Department may soon scale back restrictions on Huawei by issuing a temporary general license to allow time for companies and people who have Huawei equipment to maintain reliability of their communications networks and equipment, a department spokeswoman said.

The possible general license would not apply to new transactions, the spokeswoman said, and would last for 90 days.

China has yet to say whether or how it will retaliate, although its state media is sounding an increasingly strident note. The ruling Communist Party's People's Daily published on Friday a front-page commentary that evoked the patriotic spirit of the country's past wars.

"The trade war can't bring China down. It will only harden us to grow stronger," it said.

Global stocks, which rebounded this week on the prospect of another round of U.S.-China talks, suffered a fresh bout of selling and China's yuan slid to its weakest against the U.S. dollar in almost five months. Prices of U.S. government debt were trading higher.