"Kostya said that he had some kind of fever, seems to be mild. He has developed a dry cough," she said, adding that the prison had declared an emergency.
In March, Yaroshenko's defence said they had requested to release him due to the threat of COVID-19, while his wife said that her husband had been diagnosed with acute respiratory disease.
Connecticut's Danbury prison, where Yaroshenko is being held, has 15 people with COVID-19.
Yaroshenko was arrested in Liberia, in May 2010, on suspicion of drug trafficking. A year later, he was extradited to the United States and sentenced to 20 years in prison for taking part in a conspiracy to smuggle a large amount of drugs to the United States.