“We continue to be deeply troubled by China’s use of market distorting export restrictions on raw materials including rare earths,” said Nkenge Harmon, a spokeswoman for the US Trade Representative’s office.

“This is not the direction that China should be headed in. We will continue our efforts to engage China in the most constructive ways possible, through both bilateral and multilateral mechanisms, to address its continued use of raw materials export restrictions,” Harmon said.