MOSCOW (AP) — Since Brittney Griner last appeared in her trial for cannabis possession, the question of her fate expanded from a tiny and cramped courtroom on Moscow’s outskirts to the highest level of Russia-US diplomacy.

The WNBA star and two-time Olympic gold medalist is to return to court on Tuesday, a month after the beginning of the trial in which she could face 10 years in prison if convicted. As the trial has progressed, the Biden Administration has faced rising calls for action to win her release.

In an extraordinary move, Secretary of State Antony Blinken last week spoke to Russian counterpart Sergey Lavrov, urging him to accept a deal under which Griner and Paul Whelan, an American imprisoned in Russia on an espionage conviction, would go free.

Although details of the offer remain shrouded, Blinken’s public announcement of a proposal was at odds with the convention of keeping prisoner-release negotiations tightly under wraps. When American Trevor Reed, serving time for assaulting a police officer, was freed in April in exchange for a Russian drug trafficker, no clues of an imminent swap had emerged.

The Lavrov-Blinken call also was the highest-level known contact between Washington and Moscow since Russia sent troops into Ukraine more than five months ago. The direct outreach risks undermining a core message to US allies that isolating Russia could force the eventual withdrawal of troops from Ukraine.

It also underlines the public pressure that the White House has faced to get Griner released, which has brought some backlash. Former president Donald Trump strongly criticized the proposal that people familiar with it have said envisions trading Griner and Whelan for notorious arms trader Viktor Bout.

“He’s absolutely one of the worst in the world, and he’s going to be given his freedom because a potentially spoiled person goes into Russia loaded up with drugs,” Trump said.

Griner, speaking from the defendant’s cage in a courtroom that barely holds a dozen people, has acknowledged that there were vape canisters containing cannabis oil in her luggage when she was arrested at a Moscow airport in February. But she says she had no criminal intent and that the canisters ended up in her luggage because she was packing hastily. Griner played for a Russian women’s basketball team in the WNBA off-season.

To bolster her case, her defense lawyers have called character witnesses from her Russian team, UMMC Ekaterinburg, and presented testimony from doctors that she was prescribed cannabis as a treatment for pain. Medical marijuana treatment is not legal in Russia.

Her lawyers say they hope such testimony will bring lenience from the judge, who they say under Russian law has leeway to consider mitigating factors.

Acquittals are rare in Russian criminal prosecutions — happening in less than 1% of cases. Sentences can be suspended.

If conviction is a foregone conclusion, it would also potentially be a step forward. Russian officials have said no release of Griner could occur until the judicial process is completed.

However, a Washington attorney who formerly was resident legal adviser at the US Embassy in Moscow, said there is no formal requirement for a conviction before an exchange.

“It seems that she is in fact being used as a political bargaining chip — and the administration has already designated her as wrongfully detained presumably because they think she is being used as a political pawn,” Tom Firestone told The Associated Press.

“Given the administration’s very strong public commitment to getting Whelan and Griner out, (Russia) may want to let this play out a little bit longer and try to get more extract more concessions from the administration,” he said. “They may impose very significant sanctions as a way to maximize their leverage in negotiations going forward.”

Russian officials have given no public hint of whether Blinken made headway in his call with Lavrov. It only issued a statement urging the Americans to pursue the matter through “quiet diplomacy without releases of speculative information.”

Russia has repeatedly expressed annoyance with American statements on the case, saying they show a disrespect for Russian laws.

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Eric Tucker in Washington, D.C. contributed to this story.

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