Chinese and US negotiators are set to resume trade talks in Washington amid the threat of fresh tariffs and warnings over the global economy.
President Trump says he will raise tariffs on $200bn (£152bn) of Chinese goods on Friday with his officials accusing China of reneging on promises.
China has said it will respond with “necessary countermeasures”.
The International Monetary Fund (IMF) said the row poses a “threat to the global economy”.
“As we have said before, everybody loses in a protracted trade conflict,” the body which aims to ensure global financial stability said in a statement, calling for a “speedy resolution”.
The two sides had appeared to be making progress until recently but uncertainty now surrounds whether the talks will succeed.