A Chinese-American researcher convicted of spying in Iran is to be freed in an apparent exchange for the release of an Iranian scientist held by the US.
Xiyue Wang was arrested in Iran in 2016 for “collaborating with foreign governments”.
A stem cell expert Massoud Soleimani, was arrested at Chicago airport last year.
He was accused of attempting to export biological materials to Iran.
Both deny the charges.
US President Donald Trump said in a statement from the White House on Saturday that Wang was “returning to the United States”.