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Bill Richardson, the former U.S. ambassador to the United Nations and a prominent figure in previous hostage negotiations, traveled to Moscow this week and met with Russian leadership amid efforts to negotiate the release of WNBA star Brittney Griner, according to reports. 

A person familiar with the matter told The Associated Press on Tuesday that Richardson held meetings with Russian leaders, months after getting involved in Griner’s case.

Bill Richardson during an interview

Bill Richardson has secured prisoner releases "in both official and non-official capacities," according to The Richardson Center, a non-profit organization founded by Richardson. (Adam Jeffery/CNBC/NBCU Photo Bank/NBCUniversal via Getty Images)

A spokesperson with The Richardson Center, a non-profit organization founded by Richardson, told Fox News Digital on Wednesday that they were "unable to comment" on the reports at this time. 

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Griner was convicted and given a nine-year prison sentence last month after police said in February that they found vape cartridges containing oils derived from cannabis in her luggage at a Moscow airport.

Griner contended she made "an honest mistake" when she brought vape cartridges through the airport, adding, "I hope in your ruling it does not end my life."

The U.S. State Department has maintained that Griner was wrongfully detained and offered a "substantial proposal" for her release, as well as that of another jailed American, Paul Whelan, a Michigan corporate security executive serving a 16-year sentence on espionage-related charges.

Brittney Griner escorted out of a courtroom

WNBA star and two-time Olympic gold medalist Brittney Griner is escorted from a courtroom after a hearing in Khimki, just outside Moscow, Russia, on Aug. 4, 2022. (AP Photo/Alexander Zemlianichenko)

"No element of this trial changes our judgment that Brittney Griner is being wrongfully detained and should be released immediately," U.S. State Department spokesman Ned Price said at the time. 

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"That is why we've put forward a number of weeks ago what we consider to be a serious, substantial proposal and an effort to seek her release, to seek the release of Paul Whelan as well."

Kremlin spokesman Dmitry Peskov denied any meetings this week when speaking to Russian media. 

"There were no meetings at the Kremlin," Peskov said, via Reuters. "I have nothing to tell you on this subject."

Rebekah Koffler, a Russian-born former U.S. intelligence officer and expert on Russia and President Vladimir Putin, suggested any potential meetings with Richardson likely would not have included high-ranking officials at this time with Putin’s focus being on the war in Ukraine. 

Brittney Griner in Russia

WNBA star and two-time Olympic gold medalist Brittney Griner stands listening to a verdict in a courtroom in Khimki, just outside Moscow, Russia, on Aug. 4, 2022.  (Evgenia Novozhenina/Pool Photo via AP)

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"If such a visit did happen, the process is probably in the very early stages and doesn't involve high-level officials in the Kremlin," she told Fox News Digital. "Regardless, Putin is facing serious challenges in Ukraine now and has bigger fish to fry. He is heading out to meet with China’s Xi Jinping in Samarkand at the Shanghai Cooperation Organization (SCO). It’s unlikely that he would be approving any exchanges at this time."

According to The Richardson Center, Richardson has secured prisoner releases "in both official and non-official capacities." 

The Associated Press contributed to this report.