Prospects for progress in US-China trade talks dimmed on Monday after Washington blacklisted Chinese companies over Beijing's treatment of predominantly Muslim ethnic minorities, and President Donald Trump said a quick trade deal was unlikely.

The move by the US Commerce Department could deepen divisions between Washington and Beijing at a critical juncture in their 15-month trade war that has roiled financial markets and triggered a slowdown in the global economy.

Another flashpoint has been a widening controversy over a tweet from a U.S. National Basketball Association official. His backing of Hong Kong democracy protests was rebuked by the NBA, sparking a backlash.

Trump and his top economic adviser, Larry Kudlow, spoke in generally upbeat terms about this week's discussions with China, the first such high-level talks in more than two months, but Trump insisted he would not be satisfied with a partial deal.

"We think there's a chance we could do something very substantial," Trump said, referring to minister-level talks scheduled for the end of the week. "I would much prefer a big deal and I think that's what we're shooting for."

Pressed to elaborate on the chances of progress this week, Trump sounded more sceptical. "Can something happen? I guess, maybe. Who knows. But I think it's probably unlikely," he said.

He also said he hoped China found a humane and peaceful resolution to the protests in Hong Kong and warned the situation had the potential to hurt trade talks.

"If anything happened bad, I think that would be a very bad thing for the negotiation. I think politically it would be very tough," he told reporters at the White House.

Police in Hong Kong have used rubber bullets, tear gas and water cannons against pro-democracy demonstrators in the former British colony, which has been plunged into its worst political crisis in decades.

Beijing views U.S. support for pro-democracy protests in Hong Kong as interfering with its sovereignty.

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Representative ImageReuters

FIRST HIGH-LEVEL TRADE TALKS IN MONTHS

U.S. and Chinese deputy trade negotiators on Monday launched two days of talks aimed at paving the way for the first minister-level negotiations in months.

The White House officially confirmed that the high-level talks, involving Chinese Vice Premier Liu He, U.S. Trade Representative Robert Lighthizer and Treasury Secretary Steven Mnuchin, would begin on Thursday.

China's commerce ministry said Vice Premier Liu He would travel to Washington for trade talks with the United States on Thursday and Friday.

In a brief statement posted on the ministry's website, it also said Commerce Minister Zhong Shan, central bank Governor Yi Gang, and the National Development and Reform Commission's deputy head Ning Jizhe would attend the talks.

The talks are getting underway about a week before U.S. tariffs on $250 billion worth of Chinese goods are scheduled to rise to 30% from 25%. Trump has said the tariff increase will take effect on Oct. 15 if no progress is made in the negotiations.

The two sides have been at loggerheads over U.S. demands that China improve protections of American intellectual property, end cyber theft and the forced transfer of technology to Chinese firms, curb industrial subsidies and increase U.S. companies' access to largely closed Chinese markets.

Trump launched a new round of tariffs after the last high-level talks in late July failed to result in agricultural purchases or yield progress on substantive issues. China quickly responded with tariff increases of its own.

As Monday's talks got underway, the U.S. Agriculture Department reported more soybean exports to China, the latest in a recent flurry of buying by Beijing. China has booked deals for about 3.5 million tonnes of U.S. soybeans since early September.

Despite his skepticism about a likely agreement in the short term, Trump lauded what he called Beijing's "very, very strong" purchases of U.S. agricultural products.

Kudlow told reporters the White House had formed a "study group" to examine investment issues, but said the idea of delisting Chinese firms, reported by Reuters and other media outlets last month, was "not on the table."

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US President Donald Trump.Reuters

TRADE BLACKLIST

Beijing had no immediate response on Monday to the Commerce Department's addition of 28 Chinese public security bureaus and companies to the so-called Entity List, but Chinese officials have railed at previous listings of other Chinese firms such as telecommunications giant Huawei Technologies Co HWT.UL.

The department filing said the "entities have been implicated in human rights violations and abuses in the implementation of China's campaign of repression, mass arbitrary detention, and high-technology surveillance against Uighurs, Kazakhs, and other members of Muslim minority groups."

US officials said the announcement was not tied to this week's resumption of trade talks with China. Those listed are barred from buying parts and components from U.S. companies without U.S. government approval.

Meanwhile, China's state broadcaster dropped the games of the Houston Rockets, and two Chinese corporate sponsors suspended ties, after the US basketball team's General Manager Daryl Morey tweeted: "Fight for Freedom, Stand With Hong Kong."

He swiftly deleted the tweet and apologized to fans in China, where the Rockets have a large following.

US lawmakers expressed anger at the NBA for calling the remarks "inappropriate", and blasted the league for what they saw as a willingness to allow China to censor free speech for the sake of profit.