Censor.NET reports quoting Biden's Twitter.
"Nadiia Savchenko's unjust imprisonment has ended. Welcome home, Nadiia. Your strength is an example to the Ukrainian people, and the world," he wrote.
As previously reported, Savchenko arrived in Ukraine on May 25.
U.S. Secretary of State John Kerry welcomed the release of Verkhovna Rada MP Nadiia Savchenko and the pardon of Russian GRU officers Alexander Aleksandrov and Yevgeny Yerofeyev by President Petro Poroshenko.