The White House, meanwhile, has said they are working on a potential prisoner exchange with Russia to bring Griner and another American imprisoned in the country back to the U.S.
WNBA starBrittney Grinerhas been sentenced to 9 years in a Russian prison, on charges of smuggling drugs into the country.
Griner's lawyers said, in a statement shared with PEOPLE, that the verdict, just below the maximum sentence of 10 years, is "absolutely unreasonable" and said they will "certainly file an appeal."
"That's why I pled guilty to my charges. I understand everything that's been said against me, the charges that are against me and that is why I pled guilty but I had no intents to break any Russian laws," Griner said, according to CNN.
In a statement, President Joe Biden said the ruling was "unacceptable."
"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," he said. "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."
Russian prosecutors had asked the judge during closing arguments to sentence Griner to nine years and six months in prison, just below the maximum allowed sentence of 10 years. The prosecution also asked that Griner was fined 1 million rubles, roughly equivalent to $16,600, according to The New York Times.
U.S. Secretary of State Antony Blinken said in a statement Thursday that the Russian court's ruling "spotlights our concerns with the Russian government's use of wrongful detentions."
Last Wednesday, Blinken said that the Biden administration offered a "substantial" deal to Russia to secure the pair's release, the White House confirmed to PEOPLE, and he reiterated Thursday that they plan to "do everything we can" to bring Griner and Paul Whelan home "as soon as possible."
RELATED VIDEO: Brittney Griner Says She 'Had No Intention to Break the Law' While Testifying in Russian Court
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The U.S. reportedly offered to swap the two for convicted Russian arms dealer Viktor Bout, and Russian officials have also asked the U.S. to include a convicted murder and former Russian spy named Vadim Krasikov, according to CNN.
Both the White House Press Secretary, Karine Jean-Pierre, and a Defense Department spokesperson have said Russia made this counter-proposal in "bad faith," according to CNN and ESPN.
"It's a bad faith attempt to avoid a very serious offer and proposal that the United States has put forward and we urge Russia to take that offer seriously," Defense Department spokesperson John Kirby told CNN on Tuesday.