President Biden called Brittney Griner’s sentence "unacceptable" on Thursday after the WNBA superstar was given a nine-year prison term following her conviction on drug charges.

Griner learned her fate after a months-long trial. She was arrested in a Moscow airport for possessing vape cartridges with oils derived from cannabis in February. Word of her arrest did not make it across the ocean until March, after Russia invaded Ukraine.

Biden also made clear the U.S. government’s focus was to bring Griner, and another detained American Paul Whelan, home from a Russian prison.

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Brittney Griner was found guilty in Russa

American basketball star Brittney Griner apologized to her family and teams as a Russian court heard closing arguments in her drug possession trial said it expected to deliver a verdict later Thursday. (Evgenia Novozhenina/Pool Photo via AP)

"Today, American citizen Brittney Griner received a prison sentence that is one more reminder of what the world already knew: Russia is wrongfully detaining Brittney," Biden said in a statement. 

"It’s unacceptable, and I call on Russia to release her immediately so she can be with her wife, loved ones, friends, and teammates.  My administration will continue to work tirelessly and pursue every possible avenue to bring Brittney and Paul Whelan home safely as soon as possible."

Griner was also fined 1 million rubles, the equivalent of about $16,400.

She offered an apology ahead of her sentencing.

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Brittney Griner was sentenced

WNBA star and two-time Olympic gold medalist Brittney Griner is escorted from a court room after her last words, in Khimki just outside Moscow, Russia, Thursday, Aug. 4, 2022. (AP Photo/Alexander Zemlianichenko)

"I want to apologize to my teammates, my club, my fans and the city of (Yekaterinburg) for my mistake that I made and the embarrassment that I brought on them," she said. "I want to also apologize to my parents, my siblings, the Phoenix Mercury organization back at home, the amazing women of the WNBA, and my amazing spouse back at home."

Griner contended she made "an honest mistake" when she brought vape cartridges containing oils derived from cannabis into a Moscow airport back in February, adding "I hope in your ruling it does not end my life."

Griner was returning to her Russian basketball team, UMMC Ekaterinburg, after there was a pause in the season for international play. She called Yekaterinburg her "second home."

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"I had no idea that the team, the cities, the fans, my teammates would make such a great impression on me over the 6 1/2 years that I spent here. I remember vividly coming out of the gym and all the little girls that were in the stands there waiting on me, and that’s what kept making me come back here," she said.

Russian media has speculated the trade could be for Viktor Bout, a Russian arms dealer known as the "Merchant of Death," who is serving a 25-year sentence in the U.S. after being convicted of conspiracy to kill U.S. citizens and providing aid to a terrorist organization.

Brittney Griner enters her cell

WNBA star and two-time Olympic gold medalist Brittney Griner, right, enters a cage in a courtroom prior to a hearing in Khimki just outside Moscow, Russia, Thursday, Aug. 4, 2022.  (Evgenia Novozhenina/Pool Photo via AP)

United States Secretary of State Antony Blinken revealed last week that the Biden administration offered a "substantial proposal" for the return of the basketball player and fellow American Paul Whelan.

Blinken said during a press conference that the Biden administration made the proposal weeks ago and is hoping to speak to Russian Foreign Minister Sergey Lavrov for the first time since Feb. 15. 

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White House press secretary Karine Jean-Pierre told reporters Monday that Russia made a "bad faith" response to the U.S. government’s offer. She did not elaborate.

The Associated Press contributed to this report.