“I was talking to Brittney Greiner a few minutes ago.
She is safe,” he tweeted.
Biden said Greiner was on the plane on his way home.
Earlier, the Russian Foreign Ministry announced the exchange of American Brittney Griner for Russian Viktor Bout.
On August 4, the Khimki Court of the Moscow Region sentenced American basketball player Greiner to nine years in prison for drug smuggling and possession.
Russian Viktor Bout was imprisoned in the United States for almost 15 years.
He was arrested in Thailand at a US request in 2008 and taken to the US.
He was accused of preparing a conspiracy to kill US citizens and material support for terrorism.
In 2012, a jury in New York found the Russian guilty, he was sentenced to 25 years in prison.