"A special regime is applied to Masha. It is called administrative segregation and involves a 22-hour solitary confinement. Only two hours a day - from one hour to three nights - she is allowed to leave the cell to call her family or a lawyer, "Valery Butin said.
According to him, walks in the open space are forbidden to her.
In addition, he said, during the transfer from one prison to another Butina spent 12 hours without food and water.
As the father of the Russian woman noted, the court forbids discussing with the daughter the details of the criminal case against her.
"Masha firmly believes in her innocence and intends to prove it. Her lawyer, too, has already spoken out that a shaky case and a weak charge are quite enough. But finally all this will be decided in court, "Butin said.
He said that his daughter is visited by Russian diplomatic workers, all the nuances associated with its content are tracked, notes are sent to the State Department in particular.
"Our diplomats are working very tightly with the prison administration," the father of the Russian woman added.
Earlier, the human rights ombudsman in Russia Tatiana Moskalkova sent a letter to the US Attorney General in connection with the Butina case.