(CNN)Brittney Griner's freedom ultimately hinged on the release of a convicted Russian arms dealer whose life story inspired a Hollywood film.
Bout, a former Soviet military officer, was 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.
Griner -- who had for years played in the off-season for a Russian women's basketball team -- was arrested on drug smuggling charges at an airport in the Moscow region in February. Despite her testimony that she had inadvertently packed the cannabis oil found in her luggage, she was sentenced to nine years in prison in early August and was moved to a penal colony in Mordovia in mid-November after losing her appeal.
Griner's family had urged the White House to secure her release, including via prisoner exchange if necessary. At the center of their bid was Bout, a man who eluded international arrest warrants and asset freezes for years.
"He was finally brought to justice in an American court for agreeing to provide a staggering number of military-grade weapons to an avowed terrorist organization committed to killing Americans."
The trial honed in on Bout's role in supplying weapons to FARC, a guerrilla group that waged an insurgency in Colombia until 2016. The US said the weapons were intended to kill US citizens.
But Bout's history in the arms trade extended much further afield. He has been accused of assembling a fleet of cargo planes to traffic military-grade weapons to conflict zones around the world since the 1990s, fueling bloody conflicts from Liberia to Sierra Leone and Afghanistan. Allegations of trafficking activities in Liberia prompted US authorities to freeze his American assets in 2004 and blocked any US transactions.
Bout has repeatedly maintained that he operated legitimate businesses and acted as a mere logistics provider. He is believed to be in his 50s, with his age in dispute because of different passports and documents.
Farah told Mother Jones magazine in 2007 that according to his multiple passports, Bout was born in 1967 in Dushanbe, Tajikistan, the son of a bookkeeper and an auto mechanic. He said that Bout graduated from the Military Institute on Foreign Languages, a well-known feeder school for Russian military intelligence.
"He was a Soviet officer, most likely a lieutenant, who simply saw the opportunities presented by three factors that came with the collapse of the USSR and the state sponsorship that entailed: abandoned aircraft on the runways from Moscow to Kiev, no longer able to fly because of the lack of money for fuel or maintenance; huge stores of surplus weapons that were guarded by guards suddenly receiving little or no salary; and the booming demand for those weapons from traditional Soviet clients and newly emerging armed groups from Africa to the Philippines," Farah told the magazine.
Bout has said that he worked as a military officer in Mozambique. Others have said it was actually Angola, where Russia had a large military presence at the time, Farah told CNN. He first became known when the United Nations began investigating him in the early-to-mid 1990s and the United States began to get involved.
Bout -- who reportedly has used names including "Victor Anatoliyevich Bout," "Victor But," "Viktor Butt," "Viktor Bulakin" and "Vadim Markovich Aminov" -- is thought to have been the inspiration for the arms-dealer character played by Nicolas Cage in the 2005 movie "Lord of War."
In 2002, CNN's Jill Dougherty met with Bout in Moscow. She asked him about allegations against him -- did he sell arms to the Taliban? To al Qaeda? Did he supply rebels in Africa and get paid in blood diamonds? -- and he denied each claim.
"It's a false allegation and it's a lie," he said. "I've never touched diamonds in my life and I'm not a diamond guy and I don't want that business."
"I'm not afraid," he told Dougherty. "I didn't do anything in my life I should be afraid of."