China has various options at its disposal, beyond tariffs, in the power struggle with the United States.
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China crude oil refining increases
Meanwhile, in China, the amount of crude oil being sent to the country's refineries rose in April to match a previous record.
This is after growing production at private refiners including a big new facility in the country's northeast.
Refinery processing climbed 5% from the year before to 52.1 million tonnes, or 12.68 million barrels per day (bpd), the National Bureau of Statistics said.
The increased refining stands in contrast to slower-than-expected growth in China's industrial output last month.
And oil producing countries are increasingly looking to export refined products to offset domestic gluts.
PetroChina shipped petrol from domestic refiners to Nigeria for the first time in the first quarter.
China says the two countries are in touch, but does not say if trade talks will resume.
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China says it will raise tariffs on some US imports from 1 June, extending a mutual trade war.
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A brief guide to how the bitter trade battle between Washington and Beijing has unfolded so far.
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The ride-sharing app sees falls further below its float price amid wider market turmoil.
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The president denies new tariffs on Chinese goods will hit consumers and says China should not respond.
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The president's comments come after the US raised tariffs on $200bn of China's products.
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Andrew Walker
BBC World Service economics correspondent
We answer some of the question you posed about the US-China trade war.
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Daniele Palumbo & Ana Nicolaci da Costa
BBC News
Talks resume on Thursday after President Trump escalated the trade war with the threat of new tariffs.
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