The second day of trade negotiations coincided with an unannounced visit by North Korean leader Kim Jong Un for talks with Xi in Beijing, amid speculation of a second meeting between Kim and Trump.
The U.S. delegation - which is being led by Deputy Trade Representative Jeffrey Gerrish - is requesting China be specific on what U.S. products it will buy and on what specific dates.
The U.S. did not send its top trade negotiators that have participated in previous U.S.
"The extension of the talks indicate that both sides take this very seriously", Lu said.
The talks went ahead despite tensions over the arrest of a Chinese tech executive in Canada on USA charges she misled multinational banks about her company's business dealings in Iran.
The rebound in crude oil price action in broad market is backed by OPEC's production and supply cuts and optimism surrounding Sino-U.S trade talks as China is biggest importer of crude oil and positive outcome would lead in trade talks will lead to improvement in demand for crude oil resulting in bullish crude oil price market.
Chinese Foreign Ministry spokesman Lu Kang said the conduct of the United States ship had violated China's and worldwide law, and China had lodged "stern representations".
USA officials are expected to host China's top trade negotiator, Vice Premier Liu He, in Washington later this month, a source told CNN on Monday. A statement from the Chinese government was expected as soon as Wednesday.
Three days of US-Chinese talks aimed at ending a costly tariff battle wrapped up Wednesday in an optimistic atmosphere after President Donald Trump said they were "going very well!".
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Trump imposed import tariffs on hundreds of billions of dollars of Chinese goods previous year and has threatened more to pressure Beijing to change its practices on issues ranging from industrial subsidies to intellectual property to hacking.
Delegates to the talks have not yet revealed what specifically was discussed, or if anything was agreed to. Europe, Japan and other trading partners echo Washington's complaints that those violate Beijing's market-opening obligations.
"I think there's a very good chance that we will get a reasonable settlement that China can live with, that we can live with and that addresses all of the key issues", Mr Ross said in an interview with CNBC. Prior to the meeting, China made a number of concessions to USA demands including temporarily cutting punitive tariffs on US -made cars, resuming soybean purchases, promising to open up its markets for more foreign investment, and drafting a law to prevent forced technology transfers.
Auto and property sales have slumped as Chinese growth fell to a post-global crisis low of 6.5 percent in the quarter ending in September.
The U.S. economy grew at an annual rate of 3.4 per cent in the third quarter and unemployment is at a five-decade low.
They've also promised to allow more foreign access to its auto, finance and other industries.
For its part, Beijing is unhappy with US export and investment curbs, suggesting it might demand concessions.
For their part, Chinese officials are unhappy with US curbs on exports of "dual use" technology with possible military applications.