WASHINGTON (AP) — Russia freed WNBA star Brittney Griner on Thursday in a dramatic high-level prisoner exchange that also included the U.S. release of notorious Russian arms dealer Viktor Bout, officials said.

The Russian Foreign Ministry also confirmed the swap, saying in a statement carried by Russian news agencies that the exchange took place in Abu-Dhabi and that Bout has been flown home.

In releasing Bout, the U.S. freed a former Soviet Army lieutenant colonel whom the Justice Department once described as one of the world’s most prolific arms dealers. Bout, whose exploits inspired a Hollywood movie, was serving a 25-year sentence on charges that he conspired to sell tens of millions of dollars in weapons that U.S officials said were to be used against Americans.

The deal, the second such exchange in eight months with Russia, procured the release of the most prominent American detained abroad. Griner is a two-time Olympic gold medalist whose monthslong imprisonment on drug charges brought unprecedented attention to the population of wrongful detainees.

Biden’s authorization to release a Russian felon once nicknamed “the Merchant of Death” underscored the escalating pressure that his administration faced to get Griner home, particularly after the recent resolution of her criminal case and her subsequent transfer to a penal colony.

Biden spoke with Griner on the phone Thursday while her wife, Cherelle, was in the Oval Office. The president was to address reporters later in the morning.

“Moments ago I spoke to Brittney Griner. She is safe. She is on a plane. She is on her way home,” Biden tweeted.