Lawyers for basketball star Brittney Griner filed an appeal of her nine-year Russian prison sentence for drug possession amid talks between the US and Moscow that could lead to a high-profile prisoner swap.

Before her conviction, the US State Department declared Griner to be “wrongfully detained
Before her conviction, the US State Department declared Griner to be “wrongfully detained" — a charge that Russia has sharply rejected. (AP)

US basketball star Brittney Griner, who was found guilty of drug possession and trafficking in Russia, has appealed her nine-year jail sentence.

"Brittney Griner's defence team filed an appeal for the verdict," her legal team said on the messenger app Telegram on Monday. The date of the appeal hearing is yet to be set.

The two-time Olympic basketball gold medallist and Women's NBA champion was arrested at a Moscow airport in February for possessing vape cartridges with a small amount of cannabis oil.

The 31-year-old, who was in Russia to play for the professional Yekaterinburg team during her off-season from the Phoenix Mercury, was charged with smuggling narcotics and was sentenced to nine years in a penal colony in early August.

Griner pleaded guilty to the charges, but said she did not intend to use the banned substance in Russia.

Since her arrest, Moscow and Washington have been in talks about a potential prisoner exchange despite tensions soaring over Russia's military intervention in Ukraine.

READ MORE: Russian court sentences US basketball star to nine years in jail

Prisoner swap

The White House said it put forward a deal for the exchange of Griner and former US Marine Paul Whelan, who is serving 16 years in Russia on espionage charges.

On Saturday, Moscow indicated that it was seeking the release of a notorious arms trafficker Viktor Bout.

Bout was arrested in Thailand in 2008 and then extradited to the US, where in 2012 he was sentenced to 25 years in prison on charges of arming rebels in some of the world's bloodiest conflicts.

READ MORE: Who could be part of a prisoner exchange between Russia and United States?

Source: AFP