News CNN Exclusive: Biden administration offers convicted Russian arms dealer in exchange for Griner, Whelan

,The future of two American citizens detained in Russia could hinge on the release of a convicted Russian arms dealer, nicknamed the "Merchant of Death" by his accusers, whose life story inspired a Hollywood film.

Viktor Bout, a former Soviet military officer, is currently serving a 25-year prison sentence in the United States on charges of conspiring to kill Americans, acquire and export anti-aircraft missiles, and provide material support to a terrorist organization. Bout has maintained he is innocent.

The Kremlin has long called for Bout's release, slamming his sentencing in 2012 as "baseless and biased."

CNN reported Wednesday that the Biden administration offered Bout up in a potential swap for American basketball star Brittney Griner and former US Marine Paul Whelan, according to people briefed on the matter.

These sources told CNN that the plan to trade Bout for Whelan and Griner received the backing of President Joe Biden after being under discussion since earlier this year. Biden's support for the swap overrides opposition from the Department of Justice, which is generally against prisoner trades.

Secretary of State Antony Blinken announced Wednesday that the US presented a "substantial proposal" to Moscow "weeks ago" for Whelan and Griner, who are classified as wrongfully detained.

Speaking at a press conference at the State Department, Blinken said Biden was "directly involved" and signed off on the proposal. Although Blinken did not directly confirm Bout was part of the deal, saying he "can't and won't get into any of the details of what we proposed to the Russians over the course of so many weeks now," he said "in terms of the President, of course he was not only directly involved, he signs off on any proposal that we make, and certainly when it comes to Americans who are being arbitrarily detained abroad, including in this specific case.

The top US diplomat said he intended to discuss the matter on an expected call with Russian Foreign Minister Sergey Lavrov this week -- his first conversation with his counterpart since the war in Ukraine began -- telling reporters, "my hope would be that in speaking to Foreign Minister Lavrov, I can advance the efforts to bring them home."

"There is in my mind utility in conveying clear, direct messages to the Russians on key priorities for us. And as I mentioned, these include securing the return home of Brittney Griner and Paul Whelan," he said.

Washington (CNN)After months of internal debate, the Biden administration has offered to exchange Viktor Bout, a convicted Russian arms trafficker serving a 25-year US prison sentence, as part of a potential deal to secure the release of two Americans held by Russia, Brittney Griner and Paul Whelan, according to people briefed on the matter.

Secretary of State Antony Blinken announced Wednesday that the US presented a "substantial proposal" to Moscow "weeks ago" for Whelan and Griner, who are classified as wrongfully detained.

There is in my mind utility in conveying clear, direct messages to the Russians on key priorities for us. And as I mentioned, these include securing the return home of Brittney Griner and Paul Whelan," he said

"We start all negotiations to bring home Americans held hostage or wrongfully detained with a bad actor on the other side. We start all of these with somebody who has taken a human being American and treated them as a bargaining chip," the official said. "So in some ways, it's not surprising, even if it's disheartening, when those same actors don't necessarily respond directly to our offers, don't engage constructively in negotiations."

Administration continues to communicate offer

The official declined to comment on the specifics of the "substantial offer." They said it was in Russia's "court to be responsive to it, yet at the same time that does not leave us passive, as we continue to communicate the offer at very senior levels."

National Security Council Strategic Coordinator for Communications John Kirby said Wednesday that a senior administration official spoke with the families prior to Blinken's announcement about the "substantial proposal." Biden recently spoke by phone with Griner's wife, Cherelle, and Whelan's sister, Elizabeth.

Griner, who pleaded guilty in early July but said she unintentionally brought cannabis into Russia, testified in a Russian courtroom Wednesday as part of her ongoing trial on drug charges, for which she faces up to 10 years in prison. It is understood that her trial will have to conclude prior to a deal being finalized, according to US officials familiar with the Russian judicial process and the inner workings of US-Russia negotiations.

During months of internal discussions between US agencies, the Justice Department opposed trading Bout, people briefed on the matter say. However, Justice officials eventually accepted that a Bout trade has the support of top officials at the State Department and White House, including Biden himself, sources say.